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Trailer Wiring Troubleshooting

SOMD Terp

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2 separate (maybe related) wiring issues. 2021 ShoreLand’r Galv Trailer (originally from 195s). Before I start taking things apart, I wanted so ask you all for guidance.

1) 5 total side markers on each side. 3 in front of wheels, 1 on fender, 1 between wheel and rear. On both sides, the 3rd light doesn’t work. Could be a coincidence, but seems odd.

2) On the right (starboard) side the first 2 side markers work, but not the rear 3 (see #1 for part of that). The rear trailer light doesn’t work either. However, the blinker works by itself. When I try the blinker and the rear light, they both don’t work. Left side and rear center lights are all fine.

What does everyone think? Thanks.
 
Start with a volt meter at each point to verify there is no voltage.
 
Well, took the boat out today and when we came back to the house all of the lights worked on the trailer (except those 2 on each side). Must be a connector issue ?‍♂️ and I’ll keep an eye on it
 
Almost every issue I've had with trailer wiring (other than bulb out) has been a ground wire issue.
 
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