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All lights from the cab back suddenly stopped working

I have a 1992 Chevy Cheyenne 1500 . The entire truck bed electrically is dead. No hazards, running lights, brake lights, back up lights, plate lights, turn lights, etc. The passenger front turn signal is also not working. I have checked all fuses, fuseable links, wiring harnesses (and the wiring harness for lights was replaced 6 months ago and worked till about a week ago) I have even replaced the steering column as I was told there was no power past the steering column. Any suggestions? I did notice the junction box that is on the drivers side above the fuse box in the cab, labeled like red, blue, green, etc…) is practically empty. I don't have a diagram for these to know if there needs to be more plugs. Please help. This is driving me nuts

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no issues with ignition switch, truck starts, runs, headlights and low/high beam work, right front turn signal ok, horn blows, heater ok, ac ok, radio ok, wipers work, engine cooling fan good, and alternator returning 12-14 volts to the battery, etc.,….indicates branch electrical problem. when you find it, it’s going to be one problem only making all these things fail.

seems more likely your problem is going to be in the fuse block. it could be that there’s an open circuit that supplies power across a particular branch of fuses, thus killing the power to all those branches. Might want to check each affected circuit (each fuse receptacle) for voltage (using a multi-meter), first. Careful - if you don’t know how, be sure to get someone qualified to test (with multi-meter) for you. This should tell you if the problem is within the actual fuse block circuitry, and save you a lot of time, too. Good Luck!!

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Abby さん、ありがとうございました!
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