Question about 1996 GMC Sonoma

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Need wiring diagram for 1996 GMC Sonoma, I lost all electrical power( no accessories, none),I have 12.67 volts to the starter and alternator, fuse links to this components checked good. is there some kind of power control unit? and where.

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  • morenotpe331 Apr 20, 2009

    I do not see a main fuse box under the hood, all I see are like 4 small boxes, they look like relays, and I have swapped them around, because they have identical part numbers, and there are 3 smaller boxes in the glove compartment, which have different part numbers from the ones under the hood, but identical between the 3 and have been swapped. I have been trying to locate some kind of power control module, but have had no luck, the pickup has no electrical power at all, like I mention, the only power I have is 12.67 battery voltage and 12.67 battery voltage to the starter and alternator, fuse links to this components show 12.67 volts past the fuse links(check good)



    Richard

  • mrjhuffman May 09, 2009

    I have the exact same issue.  Did you find which fuse was gone (if that was it)?

  • carhob May 11, 2010

    truck is a 96 ,should be under hood fuse box on drivers side fender,sqare black box with big plastic screw in middle!

  • carhob May 11, 2010

    have u check main fuses in power center under hood?

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On the 96 GMC sonoma my fuses are located on a small panel on the drivers side of the dash, it's hidden by the door when it's closed, you'll see a round knob. Under my hood is ONLY the master cylinder and cruise control unit. NO fuses are under my hood either. The relays are behind a panel in the glove compartment.

Posted on Jul 22, 2010

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I have had same problems i can turn key on radio works and everything else i have found that problem with mine to be a short ground out from the main power lead from the battery to the starter that was shorting it out until i moved it around and found it

Posted on Aug 01, 2009

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1 Answer

Blows fuses


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
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