Rewiring the boat trailer lights is not a difficult job, and one can do it comfortably all by him/herself. However, one must first determine the cause of the problem by inspecting all the wires and connectors. One should use a circuit tester that has a voltmeter to determine the connectors and wires. It will confirm whether all the wires are providing power or not.
Once you have determined all the wires and connectors, start inspecting whether the white wire is securely attached to the metal frame, which is often the serving ground for the lighting system of the boat trailer. Inspect the conductivity between the trailer’s connectors and the metal frame. Make sure that the white wire is attached to the frame securely, and corrosion free.
After determining that all the connectors and wirings are perfectly operating, one should inspect whether the light assemblies are in working condition or not. If the light assemblies are not in a working condition, then purchase the light assemblies that are perfectly matched with your boat trailer.
Remove the old light assemblies, and replace them with the newly purchased light assemblies. Use the new nuts and bolts that come with the package. Reattach all the wires to the light assemblies, and recheck your boat trailer lights to see whether you have perfectly attached the wires.