Trailer light issue

[spatlennon]

Left turn signal on trailer only works when head lights are off. I also get a warning in the Rivian that there is a connection issue. I used a tester at 7 pin connection to confirm the Rivian appears to be wired correctly. I assumed I may have a recent grounding issue on the trailer (all worked ok a few weeks ago with old car.) but tested trailer with multimeter and had continuity throughout. The trailer has a 4 pin flat connector and I’m using an adapter - I tried 3 different ones, none worked. Has anyone else had an issue using a 4-7 adapter? My next trouble shooting step is to see if the trailer works properly on another truck/car. Trailer is 3 years old with led lights. Rivian is ‘24 R1S. Thanks!!

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[SwampNut]

Ground issues often show up only under load. You need to start physically checking all connections.

 

[Dark-Fx]

At least one other person complained about their trailer with LEDs not working properly, but I have not had issues with ours at all, nor the 7-4 adapter I have.

 

[spatlennon]

As a trouble shooting method, I replaced the left tail light on the trailer and now everything works. 3 year old trailer, garage kept, with everything in great condition. I didn’t expect that to be the issue but it was. Or it was fluke. Either way, completed my first successful tow today. Thanks for your help.

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