Boat Trailer Light
Fishing for steelhead — and lead — on the Snake River
Some anglers go for steelhead, others try to salvage lead weights near Little Goose Dam on the Snake River
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How to determine why boat trailer lights are not working?
I have a four winns boat trailer that the blinkers and brake lights work fine. The running lights do not work. I understand grounding can be an issue, so I looked at the ground and unscrew the ground and it broke off. I redid the ground and they still aren't working. I have two connectors to the vehicle and they do not work on either one. I had a bad bulb and replaced it. Thoughts.
I have checked the fuses.
Also, I would check continuity, between the ground wire and the brown(running light wire)? Thougths.
check your fuses. many vehicles have separate circuits for the trailer harness.
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"I have checked the fuses. " it never is that easy, is it?
Next step (after fuses): see if you got voltage at the harness plug on the vehicle. You can use one a those test plugs with the LED indicators, a 12V test light, or a multimeter set to VDC. One probe in the brown wire socket, the other in the ground socket. No voltage there, and the fuse is intact, then you got some wires to troubleshoot, and my sympathy.
Assuming the plug has power, I usually plug the trailer in, turn the lights on and go test for voltage at the light fixtures, probe the wires by piercing the insulation if there's no other convenient access point. Do this to rule out a faulty light fixture.
Power at the plug but not at the fixture, two possible causes I can think of: open circuit fault (broken wire inside the insulation), or short circuit (chafed/missing insulation, bare wire in contact with trailer frame, short-circuiting the lamps).
Since neither side works, an open circuit fault would have to be prior to the where the brown wire splits; could be in the trailer harness plug. A short circuit on either side would ground both lights.
Continuity test: one probe in the plug, other probe attach a jumper wire, and touch it to the other end of the wire. If it tests negative, there's an open circuit between the probes.
Take the lamps out of the fixtures and test for continuity between the brown wire and the trailer frame. If the test is positive, you have a short somewhere on that wire.
Filed under Accessories & Gear by on Dec 31st, 2002. Comment. 
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