Question about 2002 Chevrolet Silverado

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My 2001 5.3 litre shows voltage light on start up and gage shows low voltage it will begin to charge agian after a few minutes of idle i had the battery checked and it showed ggood next thing woould be the altenator, is it common for a altenotor to act in this manner?

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  • Chevrolet Master
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Check the idle rpm (efi around 900 rpm ) carby around 750-800rpm. Very few alternators charge under 750 rpm as it requires 14 volts to charge the battery and at low revs the alternator will be producing around 11.5-12 volts. Check tension and condition of drive belt.

Posted on Apr 20, 2013

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Posted on Jan 02, 2017

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SOURCE: 2001 Monte Carlo battery goes dead over night

9 times out of 10 it is the factory amplifier. I had this same problem and it was the amplifier. Disconnect the amp located in the trunk by the speakers and see if the drain continues. You will not have music, but having the amp replaced with an aftermarket one will solve this problem,

Posted on Jan 14, 2010

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SOURCE: my trailblazer has a idling problem, the battery

Very low idle will cause a very low voltage output from alternator, so nothing unusual about that. At low idle the truck is basically drawing from the battery, not the alternator. As soon as you cure the idle problem, the alternator gauge reading will return to normal.

Posted on Jan 22, 2010

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Why my alternator dont charge at normal engine idle thanks


You have rvc/regulated voltage control, that circuitry is in your pcm. I'm not saying the pcm is faulty, at the moment, I don't know? You also have a battery temp sensor in the battery tray housing, that might cause problems?
Check for applicable charging system trouble codes, if you haven't already.

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2004 Nissan Altima 3.5L BATTERY LIGHT went on during 15 minute drive. Next day car "died" while idling after a 20 minute drive. BRAKE WARNING LIGHT & BATTERY LIGHT on prior to full electrical failure.


Start with checking the alternator voltage with a multimeter. With the car off check the voltage in the battery which should be holding 12v charged less if flat of course then start the car and test the battery again. If the alternator is good you should be getting a reading of 14 to 14.5 v if it's the alternator it'll A) not put any charge into the battery or B) be a very low voltage being anything under 13.5 v

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It probably means your alternator needs to be replaced ! Get your self a volt meter an check voltage at the battery with engine running . Should show 13.1 to 14.1 volts if charging !

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dont ck the voltage at the car gauge use a multy meter at the baterie therminal and ck voltage you need 13.5 volts or 14

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I have a 2001 Jeep grand cherekee Laredo.. both the oil pressure Gage and the temperature Gage drops down while idling or stopped at a stop light or sign.. what do I need to fix? And how expensive is it...


Have the alternator output checked at idle and if the idle is too low incrtease it to spec idle revs. It appears that the voltage in you electrical system is too low for the gauges Check when at the lights take you foot of the brake and put tranny out of gear and see if there is a difference

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Have you had the battery tested, do that first, it sounds like low system voltage to me.

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Did you check for B+ voltage at the heavier gage wire on the back of the alternator ? When yor turn the key to run , not start , does the charge indicator light ? When the vehicle is running is that charge light lit or off ? There is a fuse that supplies B+ voltage to it . Fuse # 30 located in the central junction box , it's a 30 amp fuse ! Plus one more fuse located in the battery junction block # 11 20amp . With out B+ voltage at these connections on the alternator it will not charge .

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Upon startup engine idles rough then speeds up and returns to normal idle .After a couple of minutes the volt light comes on then no power then a complete shut down.Starts back up for a while then shuts...


OK, the volt light means that the alternator is not charging the battery. It could mean the battery is shorted out, or the battery is bad or low on charge due to an alternator not charging.

Replace the Alternator and battery as indicated by standard voltage output tests under load.

The computer in the car will not operate the engine properly on low voltage.

Fixing the charging system, may resolve the rough idle (meaning that it may be trying to relearn after data was erased by low voltage of the battery), and the speed up.


Try the charging system first, and once that is repaired, reevaluate the engine driveability and speed and idle smoothness, after it relearns.

Good luck on this repair.

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Battery is being drained but when charged battery passes load test. gage shows charging when started for about 2 minutes then the gage drops to 8 volts and the check gages light comes on.


I would think this should lead you to think that your problem is in the components which charge the battery, and not the battery itself. Voltage should remain over 12 after it is running or the battery is not being charged. If it is not being charged, it is being drained.

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