Forum Discussion

stefan_gimenez's avatar
Feb 23, 2016

BMW X5 diesel

Does anyone know the wiring for a 2012 X5 wiring. I have a curt flat 4 plug which crimps onto the tail light wires and I need to know which goes where. I had it installed at UHaul and I cannot get running lights to my trailer, and I was blowing the fuse on the wire controller when I stepped on the brakes. I had directional, then I saw that I might have to ground 2 wires so I did and now still blinkers and that's it!

Does anyone have any info to help me! PLEASE
  • My VW has a 3-way to 2-way light converter. Your BMW most likely needs the same if your brake and turn signals are separate wires. I was able to make connections to unused tabs on the taillight assembly to get all my signaling without patching into wires.
  • Since I tow with an X5, and the OP has contacted me via PM, I've answered his question. Thank you, one and all.