Trailer Signal Lights Not Working

[XCRN]

I just bought a popup camper and when the headlights or parking lights are turned on the signals and brake lights do not work on the trailer and the Jeep. The night lights do turn on though. Headlights off everything works like it should. If it matters I have LEDs for all my turn signals on the Jeep and there is currently and LED strip for the taillights on the camper but will probably change that out for regular housings. Any ideas where to look?

 

[LONGJP2]

Any ideas where to look?

I would start with checking the Jeep's trailer plug outputs.
Since it only happens when the headlights are on, it's probably because of the LEDs in your front turn signals.
YRMV