Borrowing a trailer again with a 7 way plug. Trailer has leds, no bulbs. I have a 4 way plug. In the past, I've been opening up the trailer plug and connecting a spare 4 way wire plug so i can hook it up to the plug on my truck.
Everything works like usual except the brake lights don't work. I can't figure out the problem. I've done this at least 20 times with the brake lights working.
I have the ground wire white/white connected, yellow wire for the left turn signal, green wire for the right turn signal, and the brown for the tail lights.
Brake lights don't work. What could the problem be?