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Tractor Talk Discussion Forum

trailer brakes

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mike3320

03-29-2007 16:42:24




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i have a 10000 lb trailer and my brakes arent working fuses are good in the truck. should there be power at the plug when i press the brake. i dont have power with a test light when i press the bake now. i have a brake light that also keeps blowing fuses. my brake controler has a red light when there is a short but the light isnt on any suggestions.




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KEB

03-29-2007 18:04:36




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 Re: trailer brakes in reply to mike3320, 03-29-2007 16:42:24  
Most brake controllers won't apply power to the brake circuit unless they sense that there's a load on it. I've had both a Prodigy and a Drawtite in recent years and both don't have any output unless they detect a load. Also, an inertial controller won't apply full braking unless the vehicle is moving. If they don't sense decelleration, they only apply enough voltage to hold the brakes, not to stop the trailer.

Connect a 12 volt bulb between the brake terminal on the vehicle connector. Apply the trailer brakes using the manual over-ride lever on the controller (make sure there's power to the controller). As you apply the over-ride, the bulb should light up and get brighter the more you apply the brakes. If it does, the controller & wiring are working and the problem is in the trailer. If it doesn't, either the controller is malfunctioning or there's a wiring problem in the vehicle.

Keith

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KEB

03-29-2007 18:05:57




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 Re: trailer brakes in reply to KEB, 03-29-2007 18:04:36  
Oops, should have said connect a 12 volt bulb between the brake terminal and a known good vehicle ground.

Keith



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old

03-29-2007 17:25:00




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 Re: trailer brakes in reply to mike3320, 03-29-2007 16:42:24  
With the brake pedal down you should have 12 volts going the the traiolor if you don't then you have a problem from there forward



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