Electrical frustration..., This is starting to piss me off. Options

[BMartin914]

So I have a recurring electrical problem in which my front marker lights, rear marker lights and rear tail light do not work.

I have traced down the wiring, see no problems. Cut open the harness and inspected as much as I can see (which is most of it) and still see NO problems (melting, arcing, etc.). Tonight I cleaned ALL the grounds (under relay tray, trans strap, fuse box, etc.). I then pulled all of the affected bulbs and planned to put them back in 1 by 1 until the fuse blew. Didn't get that far. As soon as I pulled the switch out the fuse blew.

This leads me to believe that wires are arcing somewhere, but as indicated, I see no visible melting or arcing. Does anyone have any ideas? I am at the point where I am willing to re-wire the circuit to fix the problem.

Anyone have any ideas before I re-wire this b**ch?

Thanks.

[BMartin914]

Fuse panel is down (probably for the 5th or 6th time, as are the light and hazard switches). Only my turn signal works, the marker filament does not. I have successfully traced the wiring from the panel to the switch and do not see anything abnormal. I have also traced the two wires leading from the other side of the fuse. The wire that runs fore appears to be fine, but I can only see so much in the trunk area due to the wrapping. Same goes for the wire running back, wthout pulling the carpet up and everything out of the interior I cannot visually inspect the wiring completely. I have not put a tester to the fuse. With a fuse in and the switch on, the 5th fuse from the left blows immediately even with all of the affected bulbs removed.

I have put sandpaper the the connectors and grounds so there should be no rust/oxidation/corrosion there.

I do have a schematic (it's a '75), I will check the wiring to the switch to ensure everything is properly connected. All the lights functioned when I got the car, I hadn't done anything when this started to happen. I just noticed that I had no tail lights, then saw no markers, changed the fuse and it blew. Have probably gone through 3-4 boxes of fuses since then troubleshooting.