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)


  • 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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Headlights won't work on my 96 GMC Sonoma flashers and signals work and running lights getting power when headlight switch is on what could be the problem.

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Fuel pump is not getting any power on 1996 gmc sonoma

And the question is?

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Jul 22, 2010 | 1998 GMC Sonoma

1 Answer


near the battery you will find a box with fuse links in, one of them
will have blown, you can bridge it temporary with a piece of wire until you get the new one from your local dealers.hope this helps

Apr 14, 2009 | 1996 GMC Sonoma

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
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!

Nov 24, 2008 | 1992 GMC Sonoma

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