Question about 1992 GMC Sonoma

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Blows fuses i have a 92 gmc sonoma and the ecmb fuse keeps blowing out but if u unhook battery for awhile and put a new fuse in the truck will run for awhile with service soon light on after a few min.it will blow fuse again

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  • Anonymous Mar 15, 2014

    dies at stop sign constantly blows 20 amp fuse ecmb

  • Anonymous Mar 16, 2014

    ecmb fuse blows as soon as you turn key switch200

  • Anonymous Mar 22, 2014

    whats an easy way to find a skint wire that keeps blowing a 20 amp fuse for your lamp in a 1992 gmc 1500

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  • 115 Answers

Generally speaking, a fuse 'blows' because too much current is drawn through that circuit. In this case I suspect a 'short-to-ground' or a bad voltage regulator (inside the alternator in a GMC). First, I would check the alternator's output voltage. Easiest just to look at your guage. Up to 14 1/2 volts is normal on a GM (with truck running), if it's higher - you need a new alternator. If it's under 14 1/2 volts, you
MUST find the short. Unless you have the specialized tools, (short-circuit finder, voltmeter, wiring
diagrams, etc.) this should be left to a competent automotive electrical shop. It could be as simple as a wire's insulation worn off or a short 'inside' the ECM (you truck's engine control computer). No matter what, one trip to a competent mechanic will probably be cheaper than continually replacing the computer and/or towing bills. Good luck!

Posted on Nov 24, 2008

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