There might be a short-circuit somewhere between the fuse box to the light.
I think that somewhere in that region is a wire that touches the body of the car, or something like that.
The body of the car is (most of the time) the mass (the negative of the battery).
For me, it could either be the wire from the fuse box to the light (maybe the rubber coating is damaged?), either the mounting stock of the light bulb (often the problem in household lamps), or the fuse holder which touches the body without any insulation.
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Driving through junk yards, a roadside electrician points out the obvious to me that my taillight is out and he could fix it for $80. After checking for about 45 min. He gets all my lights running. No more blown fuses. He said it was the headlights causing the problems. The wires were touching. Thnk
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