Hi all,
After having some issues with my tekonsha RF brake controller unpairing, and the fact that I had a p3 laying around, I decided to hard wire it in. I have it wired in now, but while my lights all work, the brake controller only displays “no trailer connected.”
I’m pretty darn sure everything was coded right, as I had the RF functioning for about 2000 miles. Coding was done by Codemycar in NJ.

Upon install I found the p3 didn’t have power, so I checked the 30a fuse- blown. Replaced that, and it’s giving the p3 power now, but only shows “no trailer connected”. Fuse is ok, and has not popped.

I triple checked my wiring. The colors all match up as they should, used 4x14g wire to extend it. Snipped the BMW connector, wired in the 14x4, and put the tekonsha connector on the end of the extension. Again, unit is powered, so I assume the ground and the positive are working at least.
I’m sure the trailers brakes are good, as they worked in September when I parked the trailer. That was at the end of a 2500 mile trip and the brakes worked the entire time. Wiring is all inside the frame- trailer is a big Tex 18’ car hauler.

Any ideas how to troubleshoot? What is the tekonsha looking for to see if there’s a trailer attached?

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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