Troubleshooting Curt T-Connector Not Working on a 2018 Ford F-150

Updated 06/03/2020 | Published 06/01/2020

Products Featured in This Question

Curt T-Connector Vehicle Wiring Harness with 7-Way Trailer Connector

(140)

$78.52

LCD Digital Circuit Tester

(28)

$28.06

Question:

Curt T-Connector Vehicle Wiring Harness with 7-Way Trailer Connector Item # C56413 I attached this to my 2018 Ford F-150 with an aftermarket brake controller. Once connected I attached it to my 27 ft camper. Lights worked so we tried the blinker left and right and both worked as soon as we applied the brake we lost all power to the camper. Iv tried everything I checked The fuses all were good. Removed the brake controller still no luck. Unplugged the harness and re applied no luck and Un hooked the battery and still no luck? Please could someone help!

asked by: Colton M

Expert Reply:

What I would do is try bypassing the tee connection on the Curt T-Connector # C56413. If you plug everything back up how it was before you installed this kit then you can test the 7-Way at the back of your 2018 Ford F-150 to see if everything is functioning properly again.

If it is functioning properly then the T-Connector needs to be replaced. If it isn't then you'll want to take a circuit tester # PTW2992 and check the OEM wiring from the rear as far forward as you can. While doing this also look for any places where the wiring is damaged or there are any bad connections. Even a bad ground that isn't connected to a clean, bare-metal surface can cause issues.

Once we get everything back up and running you'll want to check the ground connections on your trailer as well. Start with the brake circuit and span out from there. If this doesn't get resolved then you'll just keep having wiring issues.

Let me know if you're still needing help and I can look into it further.

expert reply by: Jon G