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Originally Posted by Funstuie
Thanks for the advice.
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No problem, one additional item I will add:
A lot of the issues you will find in these trucks relates to bad grounding. Either the old wires are corroded and not grounding properly, or the wire itself is toast. I was helping my brother diagnose a non-working dome light in his 82' k20 and found a wire that was 100% perfect from the outside, no knicks, no cuts, but when I tested continuity, there was a break in the wire INSIDE the plastic coating somewhere. We replaced the wire and boom it worked with no issues. For my truck, I ended up having to replace a bulb socket, which wasn't working and causing some funky acting lights working and not working and flashing when they shouldn't have been. The socket looked great, no corrosion (at least from the outside) but for some reason that was the culprit.
One additional item is that the gauge cluster, courtesy lights, and headlights all tie into the headlight switch next to your steering wheel. Sometimes this switch is the culprit. A replacement is less than $20, and a decent investment if you keep having issues even after everything else looks good.
I really suggest getting at least a continuity tester and some pigtails with alligator clips, which will go a long way to figuring out if power and/or a ground is getting from one end of the wire to another. Pick a spot where you would like to test your grounding, and make sure it gets a good ground by scuffing it up and testing against another spot on the frame.
Good luck!