GCTruck

I'm Updating my 2018 XLT SuperCrew from 4-pole trailer connector to 7-pole so I can tow a travel trailer. I have the new Hopkins 7/4-pole socket, but I need help with the wiring. I have the wiring diagram and I know where to find 4 of the 7 wires, but I'd sure like some advice on where to find the last three:
-1. The hot wire (aux power lead) (black)
-2. The electronic brake wire (blue)
-3. The reverse light (yellow)
(I understand the 2018 may be different than the prior years.)
Before I start randomly unwrapping the factory wiring and chasing wires, I'm thinking that surely this is a common chore and someone knows the answer?
(I'll also be installing an OEM TBC and new fuse box [because I didn't have the #24 fuse wired in the factory box like so many other 2018's], but I think I have that part of the project covered and just need help on finding these last three trailer wire leads.)
Thanks in advance for any help,
Glenn
< 2018 F150 SuperCrew XLT 4x4 5.0 V8 >

Mlarv

There was a nice write up in the tow haul section on how to add the 7 pin connector using the factory wiring harness from Ford. It is a very clean install. I was searching for the thread and can not find it right now. I would search that section and see if you can.

GCTruck

Thanks! Before I posted, I looked all over the forum and couldn't find anything. (I may not be using just the right search terms . . . .)

Mlarv

I just had a chance to look again. Here is the thread https://www.f150forum.com/f118/4-pin...-7-pin-309811/

GCTruck

Sonofagun!!! That's it! You are THE MAN!

In case anyone else finds this thread the updated part number for the wiring harness for a 2018 F150 is HL3Z-13A576-D . (This apparently replaces
FL3Z-13A576-B, HL3Z-13A576-B) I just ordered it from Tasca for $20 (plus $11 for shipping). If this works, it will be a real time saver (no to mention keeping my new truck looking OEM).

Thanks again!