Question about 2002 Ford F250 Super Duty SuperCab

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2001 f250 brake controler will not work

I installed a new brake controler with the plug that goes under the dash im not getting 12v(19v from the battery) to the controler and when i put 12v to the controler im getting a constant 19 v on the controler output but nothing to the camper

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  • fuller1978 Apr 16, 2009

    the factory plug under the dash all lights work on trailer checked all the fuses and not getting power to the plug in the back where the trailer hooks up

  • fuller1978 Apr 16, 2009

    all lights on trailer work just no brakes and no power to brake controler so i ran a wire from batery to the controler put my meter on the brake out put and it is a constant 19v on the back of the controler but nothing on the trailer plug on the back of the truck for electric brakes but tail lights come on on the trailer and all other lights

  • fuller1978 Apr 17, 2009

    i found that the plug on the back was dirty and where it connected to under the bed was dirty i still couldnt get the 12v supply to work i had to run another wire to it but my brakes work so im good

  • fuller1978 Apr 17, 2009

    on the new brake controlers they send out a low amperage 12v constant on the blue wire not enough to set your brakes its looking for a complete circuit to ground your trailer brakes so your controler will not come on until it senses the trailer is hooked up then the green light comes on when you press your brake pedal it turns red and applies voltage to your trailer brakes there are three thing that have to be pressent for the controler to come on 12v from batery to the black the white is ground or (-) minus and there has to be a complete circuit from wite to blue

  • Curt Downs May 11, 2010

    The black wire is the power , when you plug trailer into truck, no power at all to trailer lights, brakes?

  • Curt Downs May 11, 2010

    'new brake controller w/ the plug that goes under the dash' do you mean the controller connects to a factory installed plug? There is no power where the trailer plugs into the truck?

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  • Ford Master
  • 1,779 Answers

As you probably know, the blue wire is the brake wire, have you checked at the truck plug (for the trailer) for power to the blue (brake) wire while someone steps on the truck brake pedal? There shouldn't be any power at the plug until the truck brakes are applied, then you should have at least 12v there.

Posted on Apr 16, 2009

  • Curt Downs Apr 17, 2009

    Glad to hear it's good to go, thanks for the update.

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