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Tractor Talk Discussion Forum

O/T Trailer Brakes

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terryjd

07-11-2005 20:27:45

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I was wondering if anybody has hooked electric trailer brakes right to their trucks brake lights? I have been told that they will work that way but I always thought you needed a controller. Can anybody let me know if it will work or need controller. Thanks.

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Dan67

07-11-2005 21:11:13

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Re: O/T Trailer Brakes in reply to terryjd , 07-11-2005 20:27:45

Hooking up straight to the brake light with out a controller will put 12volts straight to the brakes. This should lock them up. A controller controls the voltage from alittle to alot(12volts) under panic stops. Not a good idea. Buying a good contoller is worth your weight in gold. Have a good day

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Vern

07-11-2005 20:59:23

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Re: O/T Trailer Brakes in reply to terryjd , 07-11-2005 20:27:45

They might work some but not very well. The wiring is not heavy enough to carry that much load. Don't try it!!!!
Vern

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Jerry Cent. Mi.

07-12-2005 04:09:21

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Re: O/T Trailer Brakes in reply to Vern, 07-11-2005 20:59:23

If your trailer has good brakes the tires will smoke every time you even touch the pedal.

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txgrn

07-12-2005 05:26:08

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Re: O/T Trailer Brakes in reply to Jerry Cent. Mi., 07-12-2005 04:09:21

That's the purpose of the controller; to control the trailer brakes. It allows you to set the amount of braking the trailer has based upon it's load and offers separate wiring to accommodate the electric load...as they are electric solenoids which lock against discs and their timing and amount of locking (current thru the solenoids) is determined by the controller.

Agree; don't try it.

Mark

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paul

07-12-2005 06:09:28

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Re: O/T Trailer Brakes in reply to txgrn, 07-12-2005 05:26:08

Yea, the controller is just a big variable resistor, and allows you to adjust how much gurrent goes to the brakes. Wiring directly to the tail lights would a simple on/off switch - full brakes or none. No adjutment for allowing _slowing_ the load, just full on. You'd blow tires pretty quick from all the flat spotting.

--->Paul

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37 chief

07-12-2005 15:55:19

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Re: O/T Trailer Brakes in reply to paul, 07-12-2005 06:09:28

Anothrer problem, if your turn signal and brake light are the same line, you will have intermitent breaking on the side you are turning. As others have said get a controller.Stan

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terryjd

07-12-2005 19:13:15

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Re: O/T Trailer Brakes in reply to 37 chief, 07-12-2005 15:55:19

Thanks for the replies everybody. I guess I will need to get a controller so when I borrow the trailer I can use the brakes. Sounds like hooking up right to the trucks lights could make an interesting trip, especially if empty.

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