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Sounds like the problem is with the trailer itself. Either it is wired incorrectly, or a wire has shorted against the frame.

If the fuse only blows after a while, a bare wire is probably rubbing the frame occasionally. This will be hard to test for, but you could get under the trailer and look at or feel the insulation, look for pinch points, and check the wiring in the lights and at any junctions.

If the fuse blows immediately, use a multimeter to find one or more pairs of wires with almost 0 resistance. Remember that 12V trailer lights don't have much resistance - look for the combination of wires with the lowest resistance and start there. Also remember to check from each wire to the frame of the trailer. Your attachment point on the trailer should be either bare metal, or a bolt that isn't rusty. Paint and rust will act as insulation.

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Q: Hook up tailer wiring harness for Chevy s10 1999 The ones I have gotten from the parts store blows fuses?
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