Originally posted by Seth Livzz:
How should I splice the side marker lights into the wiring harness? I don't know of any easy way to splice into the wires and solder them without risking water getting into the insulation eventually. Even heat shrink tubing isn't totally waterproof.
There is a heat shrink tubing that is almost totally waterproof. It has an adhesive inside that activates (expands) when you heat it and then hardens when it cools down. You should be able to find it at an electronics parts store. It looks like regular heat shrink but feels tacky on the inside. If you have a good solder joint underneath it, the joint will outlast the wire.