Troubleshooting Running Lights No Longer Working on Boat Trailer  

Question:

Expert Reply:

It sounds like there might be a weak or bad ground on the trailer wiring that maybe just took a couple of rides to fully present itself. The first thing I recommend doing is simply inspecting the 4- or 5-Way connector on the boat trailer. Look for any corrosion or debris inside the pins that needs to be cleaned out. Also inspect the wiring right behind it to make sure nothing is pinched and they are all fully secured to the connector.

Next check the harness' main ground and make sure it's securely attached to a clean, bare metal surface free of any rust or corrosion. Do the same with the individual grounds on the light assemblies themselves, whether they use a dedicated ground wire or ground through their mounting hardware.

If this does not resolve the issue please let me know and we can continue to troubleshoot.

expert reply by: Chris R

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