Wiring A Boat Trailer. As you route the wire through the trailer s frame remember that if the plastic wire covering abrades and exposes the bare wire core you ll have a short to ground. Select the right harness.
4 pin flat trailer wiring harness kit wishbone style sae j1128 rated 25 male 4 female 18 awg color coded wires 4 way flat 5 wire harness for utility boat trailer lights kits. As you route the wire through the trailer s frame remember that if the plastic wire covering abrades and exposes the bare wire core you ll have a short to ground. Disconnect the lights and remove the old harness noting how the wires were secured.
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