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I spent the last couple of days chasing down this electrical issue. I removed the dimmer switch to measure voltage and resistance. I also removed the headlight switch after finding out the previous owner decided to epoxy the knob on. I neglected to mention that the car was stripped down to the shell for a complete repaint. In order to take the front fenders off, the headlight socket must be dewired to get the wires out of the fenders. Of course I took lots of pictures so I could put it back together correctly. With my luck, the phone died with hundreds of pictures on it. So, I went online to find a wiring diagram for an H4 headlight plug and hooked them up. It turns out the diagram was for the bulb side and not the plug end. I finally figured out the ground and high beam wires were swapped. I was grounding the low beam through the high beams, hence the 5V back feed. Once I swapped the wires, the issue went away! Thanks for the help!
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