Never seen this before

[HankZudd]

When turning on headlights (2020 RedHawk 24B) the brake & turn signals don’t
Work on my 10’ utility trailer; turn headlights off, work fine using flat 4 pin connector each time; tried using 7/4 adapter, same thing

Calling Jayco Monday; any clues?

[DazednConfuzed]

Check to make sure everything is well grounded. Many trailer lighting issues are caused by poor ground connections.

[Riich]

Do the trailer lights work fine when connected to a different tow vehicle?

[Harleys house]

Do the lights to the camper work fine when you do not have it connected to a trailer?

[HankZudd]

Haven’t tried trailer on another vehicle; grounding shouldn’t be an issue since they work sometimes,
All coach lights work,,,,but thanks