Question about 2001 GMC Sierra Crew Cab

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2002 GMC Sierra High Voltage

Truck show its charging at about 18 volts. When warmed up drops down to about 16.5 volts. Changed Altenator and battery and still doing the same thing. Any idea why it wont charge at 14 volts?

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Could be just a bad gauge,thak it too auto zone and have them test it while its on the truck,if it reg the same on their tester then your got a short

Posted on Mar 01, 2009

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Wasn't charging. changed battery and alternator. by the gauge it shows 14 volts but with the truck running and i unhook the battery it dies.


Not on new vehicles , you never ever pull a battery cable while it is running ! A voltage spike can take out electronic components ! That was 60's an maybe a few 70's vehicles ! That change when they started using transistors in voltage regulators an in engine modules. If it is show 14 volts it's charging ! I will send a link on how you test the charging system. How To Check Charging System EricTheCarGuy

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1985 GMC Sierra Classic has battery charge but dies out with single click. My battery needed a jump the other day. Drove truck for 2 days. When I went to start it began to turn over then died. I tried...


the battery is probably bad, one way to test it is conduct a load test. Hook a voltage meter to the battery post and have someone try to start the truck. If the voltage drops below 10.4 volts DC, replace the battery.

Sep 17, 2014 | Cars & Trucks

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Voltage gauge drops alternator squeals. When using plow


INSPECT BATTERY ELECTROLYTE LEVEL
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The truck will start with jumper cables and idles very slow and then dies it is a 2002 gmc 1500 4x4.


your entire electrical system requires a minimum of 12.6 volts to operate correctly - if you don't have enough voltage then the system can react very unpredictably - check the voltage across the battery - if it is not 12.6 volts then charge or replace the battery to get the correct voltage - then start the vehicle and the voltage should increase to 13.5 to 15 volts - if the voltage does not increase, then the alternator is not charging and will need to have the electrical system serviced or the alternator replaced - good luck with your repairs

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2001 gmc sierra 1500. Battery light in msg center binks on and off. Voltage is fine. Battery is fine. Altenator is fine. Voltage regulator maybe?? Not sure if its located on the altenator or in the...


The regulator is in the alternator. Did you check voltage at the battery? Nothing in the diagram jumps out at me. Is the check engine light on? Maybe we could get a hint if there was a trouble code.bc11b1d.gif

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3 Answers

The battery, which is new drains and does not charge during each use of the vehicle.


you need to check the charging system with a multimeter ,start the vehicle and turn on the high beams and the heater fan to high,and put four ways on,now check what voltage reading you have at the battery post,it should not even be lower than 12.5 volts.

Jan 26, 2010 | 1999 GMC Sierra

1 Answer

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have the battery tested, a shorted cell in the battery can cause an overchargre (anything over 15 volts) condition, also verify at the battery that the system charging voltage is 16 volts.

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1 Answer

Won't start after battery died and recharged


Sounds like low voltage.
Get a boost from another car with a good set of cables.
Once started check voltage with booster car disconnected.
Is it around 14 volts?
If so,the truck is charging, so it may be time for a new battery.

If the voltage is at 12 or lower while running the truck is not charging.
May be time for a new alternator.

The battery should have charged enough in 1 hour to start the truck.
You may need a battery and alternator.

Sep 07, 2009 | 2002 GMC Sierra

2 Answers

Drain on battery..have pulled all fuses..still a drain


have battery tested it could be the problem.

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