Posted by steelhead55 on 08/21/17 - 1:38 PM
#7
Finnegan wrote:
The white ground wire goes on the screw that attaches the light to the trailer, automatically grounding it. One tail light is connected to a yellow and a brown wire, the other to a green and a brown wire.
There is a 99% chance you have a grounding problem. To avoid grounding problems on my trailers, I actually always run a grounding wire to the front of the trailer that does not typically get submerged, and ground there, with all circuits coming back to that point . I also got rid of all that ridiculously brittle #16 and #18 wire that typically comes with the kits and used outdoor rated romex, with all circuits connections made at a wiring block at the front of the trailer, located below the winch assembly (but forward of the assembly, so it wont be stepped on).
First trailer lasted 15 years without replacement lights. Current trailer is pushing 3 years without a problem.
A simple test for you to do would be connect a voltmeter and check for the presence of voltage relative to the trailer frame. You can also check the plug in the back of your truck for voltage relative to the truck frame.