Hi, I understand that the RF wireless units is probably the most painless way to get trailer brakes In my e70 X5d. I’ll be towing about 5500 lbs of racecar and trailer, so I want to be sure I’ve got everything sorted out. When I buy this unit, it has the controller that’s up front, and the box that’s mounted to the trailer tongue.

Currently, I have the oem bmw hitch, and the oem wiring harness all hooked up and coded in. Everything works on trailers that I’ve pulled, but never done anything braked before. With the rf unit, do I need to supply any extra power to any other pins on the 7 pin connector? Is it just totally plug and play?

It’s my understanding that 2 of the pins on the 7 pin connector are what controls the trailer brakes, and gives them power. If I’m not wiring those pins in, where is the RF unit getting it’s power supply from?


I just want to know if I need to do any extra wiring to get the rf unit on the trailer the power it needs.

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'10 X5 35d- 279k mi, deleted and DUDMD stage 2, daily and tow vehicle
'01 330i- Drift car: SLR Super angle, BC coils- keep it simple
'07 335i 6mt - Sold @ 171k miles- stage 2 daily commuter for 2 years