Question about 2007 GMC Sierra 2500HD

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Battery seems to be low it has two batteries witch one do you hook up to

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Which ever one that is wired to the starter which in your case would be the pass side of truck.

Posted on Apr 05, 2011

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Posted on Jan 02, 2017

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MY MOM HAS A 2000 MERCEDES BENZ S500 EVERY YEAR WE HAVE TO REPLACE THE BATTERY. NOW THE AIRTRAN IS INOP AND LOW TO THE GROUND JUST BROUGHT A NEW BATTERY AND CARE IS DEAD AGAIN!!!!


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Battery gauge reads low sometimes; will not start


Hello. I realize that you have checked all the connections per your ingition system. To be frank with you, you've checked everything I would have checked. I believe you may have either a dead cell in your battery or a short in it. If I were you, I'd hook-up a relative/friends battery and see if that works before I bought one. Your charging system seems to be alright, and the battery is the only other link in that chain. Let me know, I'll think on it more just in case. Thanks for trusting fixya to help get you going!

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Car won't start. Replaced battery. worked 3 days. They said it was the alternator. REplaced with new. worked another 4 days. had it check with advance auto said battery good, starter cranking normal....


if there is no charging then its back to the alternator or the way its hooked up? did you recharge your flat battery with a mains charger after it went flat the first time? as no alternator will charge a battery from flat to fully charged,,,,even if you drove around the world none stop! the new alternator may have given up working becouse you overloaded the voltage regulator trying to recharge a flat battery witch would mean it was very week to start with?

Nov 15, 2009 | Pontiac GTO Cars & Trucks

1 Answer

Batteries won't charge while wired to truck


Hi, seems that your alternator diodes are faulty.
You can check this by disconnecting the radio & switching off all interior lights etc.
Then remove one battery lead.
Then get an amp meter and connect it between the battery & the removed lead.
If you get a reading the alternator is drawing current , hence faulty diodes.
The alternator will still charge the battery when the engine is going but then discharges when stopped.
Also check your batteries with a hydrometer by checking the battery acid in each cell as you could have a dodgey cell in them.

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