Question about 1991 GMC Sonoma

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I need your help PLEASE: I have a 1991 GMC Sonoma Truck It is running off the battery I thought it was the alternator so I took it out and took it to be tested, it was fine. If I turn on the lights the buzzer goes off like I have the door open but the door is closed and as soon as I turn on the key (w or w/0 the lights on) the 20A IGN/GAU fuse blows. So I dont have any idea what is wrong. Also none of the gages work.Can anyone give me some ideas on what to check now? I'm very tired of breaking down.... It's the only thing I have to drive so I charge the battery and take off... Oh and by the way the fan dosn't work either. The blinkers do yea!!!!!

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Sounds like you have a wire hooked up wrong some wires are crossed. Check your wire harness under the dash or by the batt/alt for bare wires that are contacting.

Posted on Jul 27, 2010

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1994 gmc sonoma with alternator putting out 11.7 volts no matter what you have on. New battery and rebuilt alternator. What else could cause this low voltage situation. The battery and abs lights are on.


Try checking the gauge inside the truck
If it reads wrong - not to worry - just carry on as it is.

Try turning everything on - then CAREFULLY remove the NEGATIVE battery cable - if the truck continues to run WELL - the problem is most likely the gauge.

Check it the local battery store - free.

Gary @ Fix Ya.

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Hey, I've been there. If its a discount store alternator get another place to check it. May save you some grief.

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