Long story short, I bought a TH to pull with my Tacoma. Everything works fine, but I wanted a bigger truck to pull it. So, got a new F150 and the everything works but the brakes. When I manually activate the integrated brake controller, I get a "trailer disconnected" pop up on my screen. I had the dealer investigate and they say the truck is fine. Just to make sure I wasn't crazy, I picked up the TH last night with the Tacoma and again everything worked. Plugged the 7way into the Ford and still shows trailer disconnected. I want to troubleshoot, but not sure what to start with?

Do all the other functions, i.e. running lights, turn signals, brakes lights all function correctly?Get a volt meter and verify at the trailer connecter that the Ford is putting out voltage at the correct pin when someone steps on the brake pedal.Then check to see that that pin corresponds to the pin on the trailer harness that runs to the brakes.Eric

eric1514 wrote:Do all the other functions, i.e. running lights, turn signals, brakes lights all function correctly?Get a volt meter and verify at the trailer connecter that the Ford is putting out voltage at the correct pin when someone steps on the brake pedal.Then check to see that that pin corresponds to the pin on the trailer harness that runs to the brakes.EricYes, everything works except the brakes when connected to the F150.

I will add that I notice when pulling with the Tacoma that I can set the controller to 12 and not lock up brakes on trailer. Should they lock up set that high?

sound like no power to the brake controllerdoes all the other stuff work like lights and turn signals?take a test light and put it on the ground of your 7 way plug and then touch your brake controller pin and see if it lights up or put power to your controller.the controller should light up in the truck and when you step on the brakes your test light should light up

Have you checked to see if the fuse is installed and good for the brake controller? I know when I had an 09 F-150, I had to install a fuse and a relay. It was supplied by Ford, but not installed.

Why do TT brakes work on Tacoma but not F150?

24 Replies

Mark_Heisler
Explorer II
May 25, 2013
sound like no power to the brake controller
does all the other stuff work like lights and turn signals?
take a test light and put it on the ground of your 7 way plug and then touch your brake controller pin and see if it lights up or put power to your controller.the controller should light up in the truck and when you step on the brakes your test light should light up
09KZMXT266
Explorer
May 25, 2013
I will add that I notice when pulling with the Tacoma that I can set the controller to 12 and not lock up brakes on trailer. Should they lock up set that high?
09KZMXT266
Explorer
May 25, 2013
eric1514 wrote:
Do all the other functions, i.e. running lights, turn signals, brakes lights all function correctly?

Get a volt meter and verify at the trailer connecter that the Ford is putting out voltage at the correct pin when someone steps on the brake pedal.

Then check to see that that pin corresponds to the pin on the trailer harness that runs to the brakes.

Eric

Yes, everything works except the brakes when connected to the F150.
eric1514
Explorer
May 25, 2013
Do all the other functions, i.e. running lights, turn signals, brakes lights all function correctly?

Get a volt meter and verify at the trailer connecter that the Ford is putting out voltage at the correct pin when someone steps on the brake pedal.

Then check to see that that pin corresponds to the pin on the trailer harness that runs to the brakes.

Eric

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Why do TT brakes work on Tacoma but not F150?

24 Replies

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