Alternator Putting Out Low Voltage

I did a lot of researching and found out that the alternator (Bosch 120a) should be putting out around 14. Your vehicle's electrical system depends on an optimally running alternator. Put tape over the TDC hole!! Take the car to an auto parts store for a free check. If you're into batteries for any application, this book is the definitive source. Then if those are good then get a voltmeter start the van and on the dc side look and see what the volts read. The volt gauge on the dash isn't a direct reading of the system voltage; it is the PCM's interpretation of the average voltage it's measuring. Share Thread. The alternator puts out Alternating Current that fluctuates with the engine rpm at a rate of ABOUT 20 volts per thousand rpm. or just the plain and simple idle test. Tip: If the battery is low you may want to have it load tested. For a more modern car Id call it weak though. i adjust the idle to full out and i get approx 112v. A voltage drop would be more definitive than a continuity check, so long as. voltage regulator synonyms, voltage regulator pronunciation, voltage regulator translation, English dictionary definition of voltage regulator. Check the voltage a day or two after a full charge and before you go out. 5 and 15 volts of power. Ok just had about 15 min to look things over and sadly my problem became intermittent again. If the voltage regulator fails, it can result in an output that is too low to charge the battery (undercharging) or too high to safely run the electrical system (overcharging). The permanent magnet alternator (PMA) in the Evinrude E-TEC uses a rather intriguing circuit to improve the alternator output current at low and high engine speeds. Ground is simple try putting an extra wire from the battery to the alternator case. Technology Research 10176 30 Amp Voltage Regulator It seemed to put out more cold too. I think the auto industry has recognized this fact over the years as newer alternators are said to put out a higher voltage than older ones. I belive my 140 amp alternator has a 3 pin connector that goes to the alternator in addition to the BAT stud. RE: can a bad battery cause low voltage "11. This will put a lot more demand on the alternator. Probably because they aren't getting a good blast. 0 The voltage that I read will go as low as 11. Bear in mind that the voltage regulator is really a voltage limiter. 5 amps/volts. I did a lot of researching and found out that the alternator (Bosch 120a) should be putting out around 14. This article contains three separate videos that show how to physically program Balmar regulators. The CS alternator turns the dash-charge light on if the charging voltage goes above or bellow specifications. I assume you have done a sanity check on the DMM ?. Upon starting the engine the voltmeter indicated just battery voltage then after a few seconds everything went back to normal. 4V, when its engine was running. hi i need help with my 2002 corvette my alternator its not charging my battery i take it to 3 autoparts and to a shop were they rebuild them they test my alternator and it pass all 4 times my battery is a brand new ac delco i have the same issu a couple months ago were it stopped charging with out any warnings my voltage gage was always at 13 and for being diven just fine and i turn it off and. Photo 1: This 10. Don't know how or if you can do that with an internal. A low voltage condition is most likely due to one of the following conditions: • The alternator or voltage regulator has failed causing the bus voltage to drop from 14. The diodes are the electronic part of the alternator that convert AC voltage to DC. NOT GOOD! So the next morning I replaced the alternator and battery. Battery is reading about 11. I have a 1994 Ram with the 5. To get the most out of the low carb counter, it's important to know your daily carb allowance. In the old days this would mean an. Look for voltage drop in the system; a marginal ground connection can cause a lot of aggravation. a fully charged battery is considered 12. Say you are driving on a dark, rainy, cold day - heater on, defrosters on, heated seats on, lights on, stereo on, gps on, windshield wipers on, and you are charging your cell phone. Low no-load voltage: Speed to low Faulty rotary diodes Breakdown in windings Capacitor with low capacity: Check and adjust rpm Check and replace Check winding resistance Check and replace: Proper no-load but low loaded voltage: Low loaded speed Load too big Capacitor with low capacity: Check and replace Check winding resistance Check and replace. If you recently replaced the alternator with a "new" remanufactured alternator that one could be bad to your truck somewhere to get it tested. After about 2 minutes the voltage drops to 13. It was putting out normal voltage at the alternator terminal, but this wasn't getting to the battery. 0 alternator putting out 19-20 volts wires from the fuse box to the alternator. Any current passing through this resistance, causes the apparent voltage outside the battery to appear low. The assembly is located on the “mag” end of the crankshaft. The CS alternator turns the dash-charge light on if the charging voltage goes above or bellow specifications. This document describes process of testing, and bypassing, this function. Check field current. Star Delta Wiring for Alternators If you plan to make your own three-phase alternator (generator) for a wind turbine or hydro-powered waterwheel then one of the key decisions to make is whether to connect the wires in Star or Delta configuration. The ride home was about an hour, or batteries were in decent shape when we left. Because your car often will not start when the alternator is dying, an alternator that's on its way out can easily be confused with a dying battery or starter. Buying a high quality high output alternator will cost you more than option one or two but is worth every dime in the end. Note the trouble is that one brush is worn out. It seems to be charging the battery and I can run accessories. Field voltage, supplied to the exciter field via the voltage regulator, will always be greater in an overload con­ dition than in normal operating conditions. We need to remember the voltage regulator is between the battery and the alternator. There are two main problems that can result in a low voltage condition at the battery. An alternator that won't put out at least 13. The S line from the alternator was then used to switch full voltage into the regulator via the A terminal when the alternator started putting out. My wen 3500 generator has a low voltage output issue. I will test at autoparts store to confirm. You have a wiring or regulator problem. The output of the alternator system should be specified and measured at a practical & usable voltage. The S line from the alternator was then used to switch full voltage into the regulator via the A terminal when the alternator started putting out. The battery light on modern vehicles, however, is controlled by data and trouble codes. You could get a 19-20 volt reading on the alternator output, but how much do you measure on the battery terminals when the engine is running? It might need to put out that high of a voltage to get 14 Volt at the battery due to very poor connections==>losses/heat build up. 8 VDC plus or minus 15% which translates to 11. Is your battery from Walmart? Mine is and I think it needs to go back. Steer away from low voltage and/or high rpm motors. 2 at 900 idle. However, a battery could have one cell of the six shorted, and then the voltage would be limited by the battery trouble. If so, the alternator is not putting out current. How to Test a Voltage Regulator. With Delta you get lower voltage but more amps. I would also go to a shop that can do a real load test on the alternator. Hook this lead to the hot lug on the starter relay. As long as you don’t drop the battery below 11. The battery provides the initial voltage and amperage to crank over the engine, afterwards the alternator takes over in generating the power needed to run the electrical systems in the vehicle. The check gauges light comes on and the battery gauge drops from the middle down to nothing. They just flat out give and don’t produce any worthwhile energy to charge the battery with. Not Enough Power. I've been instructed by Speartech to find out what the pins are labeled as on that connector, and which one the voltage is coming out of. 4V, when its engine was running. 1V, but I'm not sure if the battery was fully charged. 0L Mercury Mountaineer isn't hard. In addition to checking the alternator's voltage output, you also need to check its current or amperage output. I had both the battery and alternator up to the NAPA store and both tested fine. No -ve voltage drop battery -ve to alt case, bolt or mount. 7 with the car off if it was a bad cell?. · Faulty voltage regulator. Does the alternator light come on when the car is running? Im pretty sure the alternator light and brake lights will come on with a dead alternator. Put the red probe on the alternator case. 1 day ago · Low-voltage Indication. If you hear anyone telling someone this is a way to check an alternator in a modern vehicle, stop them! TESTING the ALTERNATOR, is it good or bad? To charge the battery, the alternator voltage output has to exceed a minimum charging voltage. That being said, your altenator should definitely be putting out over 14 volts. Testing the alternator on your 4. Typically, for a given application (vehicle/engine), the alternator output is designed to exactly meet the vehicle's electrical needs when operating at low engine speeds -- and the alternator is built to be as physically small and light as possible (often making cooling under high load conditions very difficult) to help the manufacturer achieve. Check the voltage at the battery it should be around 12. When Everything is turned off again the voltage slowly climbs back to 13. An alternator can function properly and still not put out a charge, if you use a voltmeter at your batt + and - check voltage while car is running if its not putting out 13-14. I have been reading the various posts on voltage regulators/rectifiers. 2 volts, which is lower than a wet or AGM type battery needs for a full charge. You should also run a voltage check on the battery at idle, dim lights etc are usually and indication of low voltage. Thus it behooves us to minimize the voltage drop in our wiring. For the old generators and alternators of the 1950's and 1960's, this was not a big problem. We replaced the batteries with new ones. Your vehicle's electrical system depends on an optimally running alternator. I am unable to find the nominal value to be expected from the unit. A 12 V battery needs anywhere from 13. Is there a way you can check the field voltage? I am not sure with your specific vehicle but some cars have the voltage-regulator inside the computer. 2v on the battery when the engine was off, but what was the voltage with the engine on and running a little above idle?. It's very frustrating as I've been down that road with low voltage at WOT but everyone keeps insisting the alternator is good. It depends on a lot of things. This happens a lot. I thought well it has to be the alternator. The diodes are the electronic part of the alternator that convert AC voltage to DC. 4, cleaned mega fuse terminals and replaced mega fuse. Anybody know where that taps into the junction or fuse block?. That being said, your altenator should definitely be putting out over 14 volts. i ran it and put a. The first is a voltage drop between the regulator and battery. That's not the case anymore. Just had the lovely experience of my battery stone cold dying in our cool 102 degree weather we have today, and after waiting for just a short two hours or so for AAA to come and replace my battery the guy told me that my alternator was running at a low 13. A few days later, I checked the voltage of the battery while the engine was running, and I got 13. We put a " load" on the alternator to pull the alternator voltage down. The S line from the alternator was then used to switch full voltage into the regulator via the A terminal when the alternator started putting out. This fools the alternator into thinking that there is a major drain on the system and as such, the standard regulator works at full current. The other critical tool to effectively diagnose an alternator is a scan tool. If you recently replaced the alternator with a "new" remanufactured alternator that one could be bad to your truck somewhere to get it tested. An alternator can't put out "rated" amps. Do not forget that it is excitation-voltage (field windings) which 'tells' alternator to put out more voltage from the main windings. 0 Volts DC. The Alternator should now produce a battery voltage between 14. Indicating I may have too much wiring and i'm loosing DC voltage over distance, or it may be too thin. 36 volts per cell, and for a 12 volt charger this works out to 13. The battery light on modern vehicles, however, is controlled by data and trouble codes. Technology Research 10176 30 Amp Voltage Regulator It seemed to put out more cold too. You will have to put electrical tape over the idiot light. 6 volts? In that case I would take a look at the pulleys and belts. On a 12 volt system the high cutout voltage should be between 14. The wattage rating listed on the nameplate can be used to determine the total wattage requirments of an alternator. Alternator has been out and tested and got 15. NO EXCEPTIONS. As what JBX120 mention, the vehicle has computer controlled systems, if the voltage is low, you will get many funny symptoms. When traveling I set my cruise control on 55. 7 volts on the test bench. PART 3- Verifying that the alternator fuse in the fuse-box is not blown (if equipped). 2 when read through my OBDII port while it always stays above 12. However, if the air flow meter is faulty and putting out a voltage in the range 0. As you add electrical load by turning on more accessories, the voltage will drop. This is why we need a regulator: At 5,500 RPM the alternator would be putting out 1,000 volts and promptly fry our expensive eurolights and trick stereos. It switches rotor field current on and off at a fixed frequency of about 400 cycles per second. My only concern with these Alternator Voltage Booster diodes is that some of them require you to replace the 7. Although AC is far easier to generate by using kinetic energy through a generator, batteries can only produce DC, and this is why DC dominates low voltage and electronics applications. The electrical connectors and the internal moving parts in the voltage regulator can wear out over time, leading to regulator failure. The Alternator is not putting out enough voltage. alternator [maximizing P out in (1)] d match=1− √ 2πk 4V o ωi f. How to Test a Voltage Regulator. In many of the applications listed above, where output at low speed is most important, Eco-Tech high output at low RPM alternators can provide the electrical power needed, so that these vehicles can perform their missions more cost effectively while making both the revving up engines and the use of extra batteries unnecessary. 1970s-1990s) incorporated the voltage regulator into the alternator. Voltage began to drop right away and went down to about 11. These are the symptoms. I replaced the voltage regulator yesterday with a new one and that didn't turn the light off so today I just put in another alternator with the new voltage regulator. On Friday I started a 200 mile trip and the low voltage came on 3 or 4 times for maybe the first hour and a half. Depending on your alternator, you will probably need to raise the engine RPM above idle to get the alternator to put out the full voltage. Ideally, the GM alternator should be putting out anywhere between 13. even on the highway but at idle it quickly drops way down. This keeps the needle from flicking around like you'd expect on regular voltmeter. Also, make sure to check the wiring from the alternator to the battery. This 2005 Toyota Highlander had the latter. My alternator is pretty much brand new and has a built in regulator thats rated at 14. Voltage began to drop right away and went down to about 11. The alternator was replaced 3 times before the vehicle was diagnosed properly. With additional loads at the same time, it will be enough to exceed what the alternator can put out at idle and the system voltage will begin to drop. Penny Goldin is a retired teacher with 35 years of classroom experience who wanted to give back to her community. However, they can cut out occasionally with a low voltage battery as well. Read the voltage on the meter - Start the engine and observe the voltage on the meter. 4v but if its charging ok and you've never had any problems starting etc its probably nothing to worry about. High output aside, don't expect your alternator to do anything for you at idle speeds. 77 versus. my kenworth puts out 14. Put tape over the TDC hole!! Take the car to an auto parts store for a free check. It acts pretty much as an inverted electric motor (motion is put in, and voltage comes out). 2, then start the engine and check voltage with it running ,it should be around 14. The orignal Ford system design managed this situation by sending low voltage to the regulator in this condition (key in RUN but not running) via the idiot light resistance in the I line. If so, the alternator is not putting out current. I am trying to find out what voltage should the 18 amp alternator system on our 914 f put out. One-wire alternators are internally MORE complex than 2/3 wire alternators and therefore less reliable. If a less current is applied to the electromagnet, the Alternator creates less voltage. Attempting to pump 40 amps or more through the original 12 AWG charging wire is not such a good thing. Based on that you must have an accurate voltmeter. to me it sounds like you have a problem with your voltage regulator within the alternator. Have to put more across the terminals than you take out to fully charge it. The External Voltage Regulator Conversion Kit comes complete with a reliable Heavy Duty Adjustable, External Voltage Regulator. Recharge the batteries to 13. 2 volts, which is lower than a wet or AGM type battery needs for a full charge. We'll do this by checking the Continuity of the Output Circuit of the alternator. I take it you fool the alternator into thinking it is putting out a lower voltage using a diode or resistor to decrease the sensing voltage by 0. Penny Goldin is a retired teacher with 35 years of classroom experience who wanted to give back to her community. Belt has at least 62,000 miles on it and maybe a lot more. So I threw the meter on the battery and checked the charge rate and discovered the voltage initially starts at 14v and drops to 12v whilst idling. The majority of U. I'm mostly trying to decide if my alternator / voltage regulator is faulty (have you guys verify yours is also low) and I should take it in for service, or if I should just replace the alternator with another one (if even possible). check the 2-pin plug to see it isn't full with water. ac electrical testing and troubleshooting guide bc gen tors westerbeke corporation • myles standish industrial park !50 john hancock road, taunton, ma 02780-7319 u. An alternator that won’t put out at least 13. My wen 3500 generator has a low voltage output issue. 8 or less or the standard 14. I started cleaning grounds and connections and when i took the main cable off the bach of the alternator one of the 2 small wires was almost broke apparently and when i pulled the main cable. Bob Wexler SOB. If the alternator is puting out as much as it can at this speed then increasing the speed will result in more current. If the generator cannot put out enough amps, the system voltage will begin to decrease. A 12 V battery needs anywhere from 13. A freshly charged battery, either by alternator or charger, can measure higher voltage than that by accumulating non-chemical charge on the plates like a capacitor, so it might have to sit for a while or be discharged a little to get to that voltage. Take out the VR and see if the carbon "feet" contacts are longer than 1/4 to 5/16" long. They just flat out give and don’t produce any worthwhile energy to charge the battery with. A voltage drop would be more definitive than a continuity check, so long as. my kenworth puts out 14. Option2: Go to Napa and buy a VR38 or VR38SB (cheaper) This is a chrysler external voltage regulator. Batteries can do. I had a problem with an external and jumped the battery to the stator connection on the alternator. Field voltage, supplied to the exciter field via the voltage regulator, will always be greater in an overload con­ dition than in normal operating conditions. The plot twist is at my radio deck (audio), I can't turn it up above 17 (medium loud) or it turns it self off and says "Low voltage". i adjust the idle to full out and i get approx 112v. This is a theoretical rating under ideal circumstances with a cold alternator and a low voltage battery. 6 to 11 - 12 volts for 10 to 30 seconds and then it will jump up maybe a volt. regulator, it will see a low voltage due to voltage drop across the contact resistance. Benefit: Ensures that the voltage produced is within acceptable range. In addition to checking the alternator's voltage output, you also need to check its current or amperage output. Check the alternator gauge. briggsandstratton. The voltage is too low to push much amperage. 6 volts across the posts. Howdy fella's and fellettes. 8 - 15V across the battery. So I guess that the alternator isn't charging at low rpm. 2006 Chevy Trailblazer 4. Even a stock alternator is capable of massive voltage output, but is regulated to around 14V through the voltage regulator. 5 amps/volts. Well I have a DC3. An alternator should put out between 13. The alternator was replaced 3 times before the vehicle was diagnosed properly. Batteries can be charged just by DC as well, which is why all AC power is instantly transformed to DC when a battery is the main part of a system. I know the alternator will get put on in a timly fashion if I do it myself. More than enough for most needs. 0 incremental volts over what the battery is currently at? (ie if battery is 12. That test the service guy did by disconnecting the neg terminal only meant that the alternator was putting out enough voltage to keep it running, but maybe not enough to charge the battery. Oluseun, with the engine running the gauge should measure the output of your alternator. g insulation has rubbed through and the wire can come into contact with a valve cover, head, or intake) it will full-field the alternator, meaning the alternator will put out the maximum voltage it is capable of producing, hence, overcharging. I haven't done all the trouble shooting in the Niehoff guide, but did check the regulator readings with the engine running and got no juice on the "E" side. Check the voltage sense line to the logic module. Check that the alternator is actually turning. Voltage Regulator: Full Field Test. With the engine running, you shouldn’t see any AC voltage. Further guidance When the engine is running, an alternator generates electrical energy to supply the vehicle’s on-board electrical systems and replace the battery charge consumed during cranking. 4, cleaned mega fuse terminals and replaced mega fuse. The only reason I spoke about the wires being detached is I was attempting to get a read out of the voltage the alternator was putting out while being turned by the car's engine and not the testing machines. +ve wire from alternator not hot. Intermediate designs (c. Some of the older ones may have only put out 13. Determine the operatimg power requirements of each load and the total power requirments of all the loads that are connected to the generator. Choose from 500 different sets of alternator flashcards on Quizlet. · Faulty alternator. 7volts the whole way home on Sunday, indicating the batt voltage was low and the alternator was trying to charge it the whole time B) there was no appreciable charge on either of the 25 minute trips to or from work on Monday to charge up the battery, even though the system was reading 14. The other car I have, which had a new alternator put in about 30,000miles ago showed 14. Hoping this small leak doesn't destroy the alternator I just pUT in. A good alternator should put out between **12. Example: lights, ignition, heater, and any other systems you may be using at the time. I replaced my stock battery with Costco Kirkland Group 35 and i could start the engine fine. Whip out your multimeter and turn the selector knob to VOLTS DC. Does the alternator light come on when the car is running? Im pretty sure the alternator light and brake lights will come on with a dead alternator. 4 ? Maybe I should put the smaller alternator in : ). hi i need help with my 2002 corvette my alternator its not charging my battery i take it to 3 autoparts and to a shop were they rebuild them they test my alternator and it pass all 4 times my battery is a brand new ac delco i have the same issu a couple months ago were it stopped charging with out any warnings my voltage gage was always at 13 and for being diven just fine and i turn it off and. Turning on electrical consumers and increasing the engine speed will increase the alternator load which can provoke faults that are not evident at low loads. Upon starting, the meter would show the charge the alternator is putting back into the battery, in addition to whatever other electrical loads are on the bus. A Type-A circuit has the voltage regulator on the ground side of the field coil. In my case, my rebuilt puts out 80amps at high rpm. First let me say that I have been very reluctant to voice my continuing issue here but here goes. They test the alternator (with a meter on the large cable) and verify no output. Batteries cranks the starter quickly and it does not seem to lack any electric power. The alternator has three coil windings. How alternators work In the early days, cars used generators rather than alternators to power the vehicle's electrical system and charge the battery. 8 volts is in need of replacement or at least a rebuild. It's very frustrating as I've been down that road with low voltage at WOT but everyone keeps insisting the alternator is good. Shouldn't that indicator light come on if the alternator is not putting out enough volts? I'm posting this as I'm waiting for my battery to charge. My wen 3500 generator has a low voltage output issue. Check the out-put current of the alternator with a DC current clamp (see figure 2) to see if it is at or near the rated output current. Is there a way you can check the field voltage? I am not sure with your specific vehicle but some cars have the voltage-regulator inside the computer. Note: Battery voltage before testing is 13v. even on the highway but at idle it quickly drops way down. 6 volts DC output at rated alterna - tor current output. Belt has at least 62,000 miles on it and maybe a lot more. The poor charging is due to the voltage drop in the long run of skinny wire from the truck alternator back to the trailer battery (probably about 25 feet). Procedures for the regulator bypass test is similar to the charging system output test, except that the regulator be taken out of the circuit. Some of the older ones may have only put out 13. If so, is it being shut down by the overvolt unit? Confirm continuity for the positive battery cable to the bus and connect the VOM to the bus to read bus voltage. With the engine running the alternator will put out about 14. The S line from the alternator was then used to switch full voltage into the regulator via the A terminal when the alternator started putting out. Battery light comes on when engine is running · Low engine speed. My car (2000 passat ATQ) was only putting out 12. What’s actually occurring, however, is the amperage demands of the vehicle are exceeding the capabilities of the alternator, which is supplying the vehicle’s electrical demands. 0 out of 5 stars there is low voltage and this has given me great. The only exception is if the alternator is OVERCHARGING: in other words putting out too much voltage. Here’s the important point: the more electrical amperage an alternator is putting out, the more the alternator is resisting being turned. The alternator is putting out 16. Alternator low voltage intermittent issue This read from the volt meter in the ciggy lighter, but also confirmed with a DMM at the battery. Depending on your alternator, you will probably need to raise the engine RPM above idle to get the alternator to put out the full voltage. Occasionally it gets up to 13. Was told regulater bad. I also dug around and found a 7th gen Honda civic service manual, which contained an alternator test. I installed the new alternator and it still is putting out 11. Find out how to troubleshoot this problem with our repair help. As you add electrical load by turning on more accessories, the voltage will drop. A 12 V battery needs anywhere from 13. If not that then yes, two bad voltage regulators. What is next?. They orderd it Monday and it is supposed to be here Tommorrow. I am thinking that the alternator should be replaced as the output is at the low end (Do these things fade into failure or just die?) However, this voltage regulator failure is bothering me. Hi all, I got a 1999 Dodge Ram 1500 5. My only concern with these Alternator Voltage Booster diodes is that some of them require you to replace the 7. To make it beautiful buy the VRC38 (factor connector) this will make it easy to wire up and keep mud out. The alternator was replaced 3 times before the vehicle was diagnosed properly. uk for £15 plus £3. It is measured in amperes (amps). Please read the entire procedure before starting. The only advantage to using a low voltage reference point is that your lights will be brighter. 2, as low as 12. 0L to Find Out!. Do I need to replace the alternator?. 0 out of 5 stars there is low voltage and this has given me great. Disconnect the plug at the alternator, check it for corrosion and damage, plug it back in and see if the light is still on. The amperage rating on an alternator is basically just the amount of current that the unit is capable of putting out, not the amount it always puts out. If the voltage is higher than that examine all the negative cabling for problems. If its putting out 12 or less, you have likely blown the alternator. No output voltage at alternator output volt meter read out and. g insulation has rubbed through and the wire can come into contact with a valve cover, head, or intake) it will full-field the alternator, meaning the alternator will put out the maximum voltage it is capable of producing, hence, overcharging. However, if you have the car idling with lights on and you unhook the battery, your only power source is the alternator. Item five to check. I've seen headlights blow out when a guy opened a battery switch while an engine was revved up. However, when I test the voltage when the engine is off, it is at 12. Hoping this small leak doesn't destroy the alternator I just pUT in. The Alternator is not putting out enough voltage. I have the alternator wire from the wiring harness hooked up at position #2 on the alternator, position #1 on the alternator is what appears to be a ground connection on my alternator (black wire with a ring connector on it) and I have that routed to the battery stud (which I am now thinking is incorrect). This fools the alternator into thinking that there is a major drain on the system and as such the standard regulator works at full current. When the car is running the alternator produces electricity and the voltage should be above 13. The voltage regulator will allow the alternator to make enough power to maintain proper voltage level, but not allow system voltage to rise to a harmful level. alternators are engineered from the ground up for those that demand the very best. if it's not charging at an idle. The voltage between the stator phases are each 12 vac at 2000 rpm and the voltage does not increase with rpm. With greater out put and demand on the same physical size alternator can cause early failure. Today an article slash guide dedicated on overclocking the GeForce GTX 1080. Current is fed to the battery and other power absorbers through the large Bat terminal on the back of the alternator.