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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.
 

FSH 210 Sport

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Start with a volt meter at each point to verify there is no voltage.
 

SOMD Terp

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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
 

scokill

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Almost every issue I've had with trailer wiring (other than bulb out) has been a ground wire issue.
 
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