Hi there I was in the process of replacing the lights on my box trailer in doing so I was playing around with the cables to figure out the correct wiring. In the process I think I somehow managed to blow a fuse or damage something in the car because the lights on no longer working I have tried connecting different trailers that I know work including my portable spare trailer light panel and none of them work.
I have checked all of the fuses in the car using a multimeter and none of them seem to be broken the cable itself is perfectly fine I can’t see any issues there plus it worked prior to me testing the trailer wiring.
Does anyone know what the problem might be and how I can troubleshoot it. Another clue is that the rear electrical Windows also stop working at the same time.
The car is a Volkswagen Jetta 2006 it did not come with the trailer lights installed that was done aftermarket.
PS I’m too cheap to take this old banger to the repair shop.