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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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1992 Chevy C3500 7.4 L Total loss of electrical power

Customer Question

1992 Chevy C3500 7.4 L
Total loss of electrical power started truck, ran fine, then suddenly, nothing. no power to accessories/lights nothing.
Submitted: 1 year ago.
Category: Chevy
Expert:  Randall C replied 1 year ago.

Hello, are you saying nothing works at all kind of like battery was taken out? also have you done or tried anything?

Customer: replied 1 year ago.
Nothing works. Batteries test good. Checked interior fuse panel. No blown fuses. Replaced IGN and Batt relays in intererior fuse box. No change. No evidence of burnt wires under hood. Truck had started and was running normally. Hit switch to send air to airbags...and everything shut down. No power anywhere. Batt connections are tight, and alternator is good.
Expert:  Randall C replied 1 year ago.

do you have a testlight or meter/?

Customer: replied 1 year ago.
Expert:  Randall C replied 1 year ago.

I am sorry, I am unable to pull up diagrams at the moment so, rather than keep you, I am going to opt out, Another expert should be along soon to help

Expert:  Roy replied 1 year ago.

good afternoon my name is ***** ***** I will assist

I attached a wire diagram for you to review. there is a fusible link the powers everything that is down by the starter motor. check this link. it is a common failure for no power.