Question about 2000 GMC Sierra C/K3500

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Voltmeter doesnt stay steady it bounces around between 9 - 14 on the gauge. rpms run normally about 500 - 700

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  • Andrew Gibson
    Andrew Gibson Feb 11, 2012

    its a 99 gmc sierra sle k3500 dually it has a 454 big block engine. serpintine belt system. could it possibly be caused by a loose or missing ground wire in the charging system?

  • jeremiah horgan Feb 11, 2012

    yes any loose connection can cause this to happen ,,,,

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Probably in dash, just bend ears back that hold the gauge in.
(involves removing dash)
Well before you do that use a volt meter take some readings and definitely
check grounds first. Start with the easy stuff.

Posted on Jul 23, 2012

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What model car have you ,, the rpm seems a little low ...too slow a speed coupled with a loose fanbelt would cause your problem

Posted on Feb 11, 2012

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