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I had a wiring spaghetti jungle between the grille and the radiator support from the addition of the years of a snow plow, snow plow lights, fog lights, high intensity off road lights and a switch over from sealed beam headlights to halogen style round headlights. Over the course of the prior installations I had to control the off road lights with a relay and the halogen lights with 2 relays (one for high beam and the other for low beam) because they drew too much amperage for the high beam / low beam floor switch and the headlight switch. Both burned out previously. Anyway I was having headlight and turn signal problems this fall and finally decided to clean up the mess. So I began cutting out all the wiring and starting over checking each circuit as I went. I was surprised by the ground when off / 12 volts when on situation so I figured I had an erroneous ground problem on that circuit. But before I spent hours tracing out the entire circuit I remembered that my friend had a similar truck (79 F150 vs my 75 F250) with the same circuitry according to the wiring schematic. Anyway as long as it apparently is correct as wired, I can now complete my rewiring job.
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