Posted on Mar 15, 2009

Battery drain 2001 gmc 2500 hd pickup

The alternator seems to be charging because the volt meter reeds over 14 volts when running, I put a new battery in and the battery was dead after 2 nights when starting in the mornig. What is the first thing I should check fro battery drain?

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phaseconvert Mar 17, 2009

I found the problem it was the relay for AC it was shorted and draining the battery. Put a new relay in and it solved the problem, thanks for the input and suggestions
Anonymous May 11, 2010

im glad youve found it! im glad youve found it!
Anonymous May 11, 2010

u can check the underhood light if it stays on ,forgetting to shut off map light,cargo light,truck cap light if equip.,accessories on like elect. converter for tool chargers,could be mal function with interior lighting syst. stays on,theres lots of things!

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Anonymous

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Posted on Dec 24, 2010

Anonymous

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On cold start up, starts fine.When i start driving all gauges needles start to sweep.. fuel empty to full spedo 0 to 100 amps and oil gauges sweep back and fourth. emerg brake gos on and off message center flashes battery in red and yellow.
seems like its possessed..

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0helpful

1answer

Said alternator was bad

Bad alternator means no battery charge. Run the battery down without a charging means no power and engine will die. Charge the battery and put a meter on it to see if it goes to 14 volts with engine running. If stays under 13 volts with engine running, replace the alternator.

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Sep 25, 2014 • 2001 Mercedes-Benz CLK-Class

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1answer

Can alternator put out 14.2 volts but not enough amps to charge battery and turn off dattery light?

Yes and no.
It sounds like you have a wiring problem.
The alternator output could be 14 volts and only one or two amps, but that would be enough to kill the warning light. Its more likely the alternator is charging but the current is not reaching the battery.

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Aug 26, 2014 • GMC Envoy Cars & Trucks

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Battery wont charge, battery/ABS/SRS/BRAKE lights come on while driving and flicker. voltage increases to dash lights/fan speed/headlights periodically.

Get a volt meter, start your car and see how many volts your car is producing while running. Should be around 14 volts. May want to watch the meter for a while since your electric seems to fluctuate. Most voltage regulators are internal of your alternator. If you are getting a lot more or less than 14 volts while running, replace the alternator. If it is not charging, voltage will drop as vehicle runs, until battery is dead.

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Dec 12, 2013 • Cars & Trucks

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The volt gauge reads 14 volts when the truck is running (2004 Chevy 2500 HD, 6 Liter) after I shut it off Voltage gauge reads 9 volts as low as the gauge goes. The starter acts like it is not getting...

14 volts is close (14.5-14.8 volts is required
and 9 when shut down indicates a bad battery
have it load tested and then have the alternator tested for rectifier pack operation
there should be 14.5 volts DC at the battery when running or it is not charging the battery
if you have 14 volts AC replace the alternator with a serviceable unit

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Aug 08, 2017 • 2004 Chevrolet Silverado 2500HD

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1answer

Battery discharges in about 3 days if not run.

it may have deffective diode on the charging system(the alternator). 14 volts is an over charge in a battery. ampere reading must be on what the battery designed.

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Mar 01, 2012 • 1997 Jeep Grand Cherokee

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My battery is fully charged, the alternator is new. if i disconect the battery the truck will shut down....What do i need to check for???

First off, never disconnect battery when vehicle is running. It could stress out the alternator and blow the diodes. Now you need to put a volt meter on the battery while the vehicle is running to see if the alternator is putting out 14 volts. If its putting out 12 or less, you have likely blown the alternator. Remove alternator and have tested free at Orielys or napa. I dont trust autozone.

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Oct 09, 2010 • 1995 GMC Suburban

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I have a 2001 GMC 2500HD. While driving down the

It sounds like your alternator might be starting to go bad and the Battery Light is coming on because it is not charging the battery correctly. Have your Alternator checked with a volt meter, it should be reading 13 to 14 volts if working correctly. If not, replace your alternator.

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Jun 15, 2010 • 2001 GMC Sierra 2500HD

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When i start my ram 2500 w a diesel, the gauge says it is charging fine. then i start driving, and the meter goes to 8 volts. i noticed the fuse that is in the power centre is blown. is this the caus eof...

Replace the fuse and check the wire from the alternator to the fuse for damage. Also check the batterys before you change the fuse and after with the truck running with a volt meter. After the fuse replacement the battery should read 14 to 15 volts. Also check the fluid level in the battery. If the cells are low you can put distilled water in them to bring them back up to proper level. Hope this will help you.

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May 24, 2010 • 2001 Dodge Ram 3500 Truck

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1994 olds cutlass supreme volt gauge shows low I have a new battery and a new altenator could the both battery and altenator put out correct volts no drain on battery even change dash volt meter still in...

check with a volt meter if u have 12 volt at the big lead on the back of the alternator engine off

if thats good start engine check to see if alternator is charging check the battery a good alterntor charges 13.5 - 14 volts, u may have a bunk alternator

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Mar 25, 2010 • 1994 Oldsmobile Cutlass Ciera

1helpful

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My 2000 ford ranger and something draining battery

bad alternator possible or bad battery..even though its new that battery can be bad. I would take a volt meter and with the engine running check the volts of the battery..If the volts are 12 you need to replace alternator, if volts are 14 you need to check the battery. to check the battery hold the volt meter to the battery and have someone start the car..while the starter is cranking battery volts should not drop below 10volts.if they do your battery is bad.

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Jun 11, 2009 • 2000 Ford Ranger SuperCab

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