Question about 2003 GMC Sierra 1500

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I have a gmc 2003 z71 with codes 1637&1638 battery not charing alt is ok? Need help. Battery is new checks out good. Truck battery drains with in 5 mins truck stops running. Tech checked the truck he says it could be computer, cluster package. Replaced cluster 3 times all ready

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  • Jeffrey Turcotte
    Jeffrey Turcotte Oct 06, 2010

    do you have a voltmeter in the panel, and, if so, what does it read with the engine running?

    Why replacing cluster--instrument cluster?

    Have you checked for a short?

  • redboat1359 Oct 06, 2010

    Yes, it reads about 10 volts then falls, when I charged the battery it read norm, then plus 14 volts

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  • GMC Master
  • 8,734 Answers

OK, I'd say you have a short, and a big one at that. Can you troubleshoot circuits? If yes, start at the engine compartment relay box and start checking fuses and any fusible links or circuit breakers in there.

Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

If you find a bad circuit, I can pull your wiring diagrams and tell you where to look for the short. Please remind me what the z71 means--this is a Sierra, right? Do you have dual batteries?

Posted on Oct 06, 2010

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