Question about 2003 GMC Sierra 2500HD

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Battery drain in 2days

2005 duramax I had the truck at the dealer who replaced 1 battery 2 days later both batteries have 3 volts left. This problem started 2 months ago with batteries needing to be charged then everthing was fine; trip to Canada and back then sat for a few days same problem. Are there any reported harness issuses

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It may be the dealer changed the wrong battery. To check the batteries and other battery drain issues here is how: With both batteries fully charged simply disconect the + on the older battery when you have stopped for the night. Then In the morning check the voltage in both batterie's. If the older battery is still fully charged then it is O.K. if it has lost charge then most likely the new battery is leaking power through the older one when the power goes down in it. If it is now confirmed the older battery is good then check the voltage in the new battery it should be low. The most likely reason is a faulty alternator although it is charging the batteries when the car is running it may be draining it when the car is stopped so this is the next check. Connect the + on the older battery again. The next night after stopping for the night and with the batteries fully charged again disconnect the wires on the alternator in the morning check the voltage in the batteries again.If the batteries are still fully charged in the morning then its alternator trouble.These checks you can carry out yourself so won't cost anything Replace which ever (if any) is faulty. When you have performed these test's and the problem. These are the most likely causes but their are a few other check we can perform if the problem is'nt solved .Get back to me after you have done the above check's and if you still have the problem I will advise further.

Posted on Sep 07, 2009

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I would have changed both the batteries the first time. Little expensive but usually if one battery is shot the other one isn't far behind. I ran into this problem before only on a my ford , I managed to track down the problem after several days of checking wiring harnesses ect. turned out to be the positive cable lead between both the batteries.
I would have a scan done, money well spent at least you won't be pulling your hair out and playing the guessing game. Some places do scans for free, phone around and find out.

Posted on Sep 07, 2009

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Well there either something staying on and draining the batteries or your alternator isnt charging the batteries.

Posted on Sep 07, 2009

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1 Answer

Battery drains while sitting


Hi Anonymous, perform the following tests:
1. Fill acid type batteries to proper levels.
2. Charge battery overnight at 1-2 amps you need 12.5 volts or better after charging.
3. Hook up battery positive cable, then with your multimeter on the milliamp scale connect one lead to the negative battery post and the other lead to the ground cable. Meter should read 3 milliamps or less, 10 milliamps with a radio, 15 milliamps with radio and CB. If your meter reads higher you need to isolate the circuit by pulling fuses and circuit breakers one at a time and observe meter for drop in aprerage then get out your test light and track down the short in that circuit.
3. Make sure all connections are clean and tight especially the negative cable at "BOTH" ends.
4. Hook up volt meter to battery and start engine, if meter falls below 9.5 v while cranking replace battery.
5. With engine running at 3600 RPM battery should read 14.3-14.7 volts if not continue tests.
6. Unplug voltage regulator from alternator at crankcase by front of primary cover.
7. To test voltage regulator go to: https://www.youtube.com/watch?v=F8EjV0IjW9Q
8. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace stator.
9. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace stator.
10. With volt meter set on AC scale, both leads touching alternator pins meter should read
16 to 20 volts AC for every 1000 RPM'S 1989 and later and 19 to 26 volts AC for every 1000 RPMS. If not replace rotor.
17. For a free wiring diagram please visit the website below. Good luck and have nice day.
Harley Davidson Wiring Diagrams and Schematics

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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