Having an issue with the running lights on my boat trailer. Brake lights and turn signals work just fine but when I turn on the running lights they come on for a few seconds and then go off. If I try turning them off and back on nothing but if I wait a little bit and try again I get the same results. I replaced the ground connection at the ramp the other day but with the brake/turn signals working I do not think it is a ground issue. Could there be a chafe in the running light wires and the exposed wire touching bare metal causing this? If so will a test light work on he wires in front of the issue even with the lights coming on?
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for start check wiring from pig tail thru the front tube of your trailer, if not covered by a split wire loom, can cause the wires to get rubbed to short wire to metal. Also the individual wires to marker lights and there respective grounds. test light can test the ground and power wires. use of quick clip wire connectors* are not good to use.. Best is butt connectors and heat shrink tubing, and split wire looms to cover wiring to prevent the chaffing of wire. 
Originally Posted by WooCCBM
) so it has double shrink wrap. Some boats use a smaller diameter wire on the marker lights...try to find heavier wired marker lights.
