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Cobolt charging 15.2 volts, new bat, new alt , yyyyy

My cobolt, chevy 2010 , is charging aqt 15.2 vol;ts, i put njew battery, brand new altorter, y over charging

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Faulty regulator
max charge allowed is 14.5-14.8 volts dc

Posted on May 07, 2017

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Posted on Jan 02, 2017

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1 Answer

Help locating a short.


have the voltage regulator checked
also have the rectifier pack checked in the alternator by using a multimeter that reads ac as well as dc volts
if it is ac volts , replace the alternator
if the voltage regulator is faulty there will not be enough volts to charge a battery
At this point I doubt if it is a short in a circuit but a problem in the charging system

Nov 17, 2017 | Dodge Cars & Trucks

2 Answers

Put a new alternator and battery on the truck but still does not charge


Hi George,
I need year--make--model--engine size.
Usually the alternator needs excite voltage or no charge. The alternator bat terminal should be hot all the time, even with key off, if it isn't, something wrong with that wire circuit.

Mar 04, 2016 | Cars & Trucks

1 Answer

New battery not charging after changing the alternator


First make sure both battery cables are free of corrosion and ground is secured to chassis and engine then check to see if theres an alt. fuse or bat. fuse blown. Another way to test charging sys w\out an meter is to remove the ground terminal from the bat. with the car running, if the alt. is good car stays running, if all else fails take the alt and bat to a parts store that will test them for free

Dec 14, 2013 | Chevrolet Venture Cars & Trucks

1 Answer

Bad eld wire or ecu?


Sounds like the alternator is charging, but the extra voltage is not reaching the battery. You should have battery voltage on the large wire at the alternator with the engine off.
If not, that wire is fried or a fuse is blown.

Jul 07, 2013 | Cars & Trucks

1 Answer

Put in new alternator,shows charging and battery holding charge but battery light stays on. You start car and light stays off for about 15 to 30 sec. than on.


The alt should charge at around fourteen volls , any ways, yogi need to put another battery. A weak alt will kill a good bat.and vise versa

Aug 30, 2011 | 2003 Ford Taurus

2 Answers

Battery on full charge then start truck drive to town and noticed volt gauge at low turned lights and access off got home shut truck off tried starting after shut down and noting but dead bat havn prob...


You need to fully charge the battery and load test it, then check the charging system and alternator drive belt for tightness. do not remove cable when running or it can harm the charging system...ok on older cars, no longer good practice. Quick check of charge system can be done with volt meter across the battery. Volts should read between 13 and 14volts and not drop over time. With all lights, heater etc on volts should be better than 12.5 (usually above 13 and again, not drop with time.

Oct 26, 2010 | Ford F-250 Cars & Trucks

1 Answer

My alitnator pump around 13.5 when running could that be over chargin my batery,, if i dont drive it for a couple days my bat is dead i charge it but there not enough amps to turn over,, i bought a new...


should charge at more like 14.2 volts running. Don't know what year it is ,diag on a chrysler product is usually simple.Earlier firewall mounted regulator ? ground the striped wire (white,green stripe I think)Should charge like 15-18 volts with the wire grounded Later engines the regulator is in the alternator. Have to change it.
Needs to charge harder than 13.5 tho.

Oct 07, 2010 | Dodge Ram 1500 Cars & Trucks

1 Answer

Code 43 . my alt stayes at about 11 12 volts when


CODE 43 IS ELECTRONIC SPARK CONTROL -.KNOCK SENSOR.LOOKS LIKE ALTERNATOR NOT PUTTING OUT ENOUGH VOLTS TO CHARGE BATTERY.YOU NEED 13.5 TO 14.5 VOLTS.CHECK ALTERNATOR FUSE AND ELECTRICAL WIRES.MAKE SURE BELTS NOT SLIPPING.IF ALL IS GOOD.REMOVE ALTERNATOR.LET AUTO ZONE CHECK IT.TO MAKE SURE.TURN OFF RADIO BEFORE MOVING BATTERY CABLES.SO YOU WONT LOSE RADIO CODE.YOUR CAR IS NOT GOING TO RUN RIGHT IF THE ECM DONT RECEIVE 12 VOLTS OR 13 VOLTS.

Sep 24, 2009 | Chevrolet Silverado 1500 Cars & Trucks

4 Answers

Put a new alternator in 2000 Jeep Grand Cherokee engine light on


well , the ECU runs the alternator. (DG wire "dark green")
the alternator field is controlled 100% by PCM reg , inside PCM.
so..... if the running engine has 13.3, to 15vdc the alt is working
if lower, its not. (rpm on engine 800 or more)

not scanning the PCM a the CEL glow, you missed the boat.
why not scan it. see why the PCM is upset (DTC errors stored)

see the 2 lower pins below , those go to PCM.
in theory if the field in the old BAD ALT, was shorted.
that could in fact, burn up the PCM regulator.
shorting outputs of PCM , does that in most cases.
im the poor sod that fixes PCM's.so....

1946421-gyllgess1dmtl30sgxtyvqv2-3-0.jpg

Apr 07, 2009 | 2000 Jeep Grand Cherokee

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