Posted by NCWayne on October 31, 2012 at 17:14:18 from (69.40.232.132):
Having some electrical issues with the running lights on a late 80's L8000 Ford dump truck. It took me several hours this evening but I at least managed to find and fix several shorts, and at least get the lights working if I bypass the relay. The way it was the owner had put several self tapping screws through the wiring harness, there were a couple of bare/abraded wires on the dump bed, etc, etc. My problem now is when I turn on the switch the clearance lights on top of the cab will light(( as they always have ))but it still won't send power to the relay that turns the rest of the running lights on. My question is does anybody have a wiring diagram, or just know where the wires go after leaving the dash switch. To be more precise do you know where the two seperate wires split/join together that send power to the two seperate parts of the clearance/running light system??? I'm planning to do some more looking tomorrow in the daylight again but thought I'd ask here and maybe save myself a little time sarching and tracing wires behind the dash.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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