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Tractor Talk Discussion Forum

Help! Electric Brake Wiring

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daniel gillespi

11-25-2004 10:25:37




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Hey bought a 85 chevey 3/4 ton custom deluxe. I want to wire it to pull my trailer. The box is there and the rear wire plug is there. All the wires at the rear plug work. It has a green, yellow, brown, and white. Up front all the wires are cut from the sliding spring that controls the tension i think. I need to find out how to wire the spring thing!




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Jerry L/az

11-26-2004 05:09:19




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 Re: Help! Electric Brake Wiring in reply to daniel gillespie, 11-25-2004 10:25:37  
What you are describeing sounds like the old controllers. before all the electronics if you have a computer in the truck they are not recommended. now back to what your are asking. do you have a steel line from the master cyclinder into the back of the controller? you have the old old style one wire comes from the batt into a circuit breaker 20 amp (get it at napa) one wire goes to ground and one wire goes to that sliding spring or reostat from the raostat it goes to the brake wire to trailerhope this helps..... .Jer

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paul

11-25-2004 22:21:54




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 Re: Help! Electric Brake Wiring in reply to daniel gillespie, 11-25-2004 10:25:37  
I have never heard of such a thing, so you got me curious.

I went to www.google.com and typed in

"electric trailer resistor brake controller"

and got several good & interesting sites that may help you. try it.

--->Paul



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Gerald J.

11-25-2004 19:17:44




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 Re: Help! Electric Brake Wiring in reply to daniel gillespie, 11-25-2004 10:25:37  
Those "sliding springs" are resistors. They set the maximum brake current and so the maximum brake actuation. They should be between the brake controller and the trailer brakes. In series. Not between the 12 volts and the controller. Slide the connection along the wire to short out more of the wire to increase the brake action.

Gerald J.



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John *.?-!.* cub owner

11-25-2004 21:01:03




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 Re: Help! Electric Brake Wiring in reply to Gerald J., 11-25-2004 19:17:44  
Danielle, it has been so many years since I had seen one I had forgotten, but Gerald is correct that the spring should be between the controller and the trailer, not between the 12 volts and the controller as I earlier stated.



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daniel gillespie

11-25-2004 19:21:53




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 Re: Help! Electric Brake Wiring in reply to Gerald J., 11-25-2004 19:17:44  
Can anybody point me to a diagram, i have searched google for everything i can think of.



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123

11-25-2004 17:59:05




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 Re: Help! Electric Brake Wiring in reply to daniel gillespie, 11-25-2004 10:25:37  
this may help



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daniel gillespie

11-25-2004 16:44:04




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 Re: Help! Electric Brake Wiring in reply to daniel gillespie, 11-25-2004 10:25:37  
It still has the old box that activates of the hydralic brakes. It has a knob the moves from left to right when you depress the brake ppedal. It only has three wires coming out the back! All the diagrams for the new boxs have four. Am i supposed to have four or three. I will try to take a picture to beeter explain!



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Kelvin

11-25-2004 16:57:40




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 Re: Help! Electric Brake Wiring in reply to daniel gillespie, 11-25-2004 16:44:04  
Are you saying that there are 2 boxes up front? If so, somebody probably already switched to the new control.

Or is there only the 1 box plumbed into the brake line? If so, I think it should have only 3 wires. If I recall correctly, 1 is the hot from the battery (you need a 20a circuit breaker in it, though) 1 works the trailer brakes. (should vary current when you move the knob) 1 activates the trailer brake lights. (It should not vary current. it should be either on or off.) (And why they used a circuit separate from the vehicle, I don't know.) All the rest of the wiring for the plug should be wired into the brake/turn lights on the rear of the truck.
OH-if its like mine, you can manually apply the brakes by sliding the knob. and if you turn the knob you vary how much the brakes are applied on the trailer. (The more the knob moves, the more brakes.)

I'm just telling you how mine is. Yours might be different-so be careful.

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Van in AR

11-26-2004 04:44:36




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 Re: Help! Electric Brake Wiring in reply to Kelvin, 11-25-2004 16:57:40  
One wire is for twelve volts, one goes back to the trailer brakes and the last one of the three wires should be a ground, the brake lights for the trailer are wired from the vehicles on the back bumper.
Van



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daniel gillespie

11-25-2004 19:08:13




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 Re: Help! Electric Brake Wiring in reply to Kelvin, 11-25-2004 16:57:40  
yes there is only the old brake control that is plumbed into the brakes that has a sliding knob. Would an 20 in line fuse work. I am getting power to the left turn and right turn signal at the plug in the back. There is a connecter that plugs in to the whole tail light turn signal asembly to activate the rear plug for the trailer.I need to find out how to wire the slidding springs under the hood on the left side of the truck.

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John *.?-!.* cub owner

11-25-2004 15:23:40




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 Re: Help! Electric Brake Wiring in reply to daniel gillespie, 11-25-2004 10:25:37  
Danielle, that spring was used with the older controlers that operated from the hydralic brakes of the truck. It controlled how hard the brakes were applied. If it now has one of the more modern inertia controllers it is no longer needed as that contorl is part of the controler itself. If you still have the original hydralic actuated controler the spring goes between a source of 12 volts and the controler itself.

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Bob

11-25-2004 11:23:08




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 Re: Help! Electric Brake Wiring in reply to daniel gillespie, 11-25-2004 10:25:37  
What make brake trailer brake controller do you have?

Google" braker controller wiring" for a bunch of info.



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Ray,IN

11-25-2004 19:59:42




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 Re: Help! Electric Brake Wiring in reply to Bob, 11-25-2004 11:23:08  
This is the best I've found for trailer wiring instructions. It is even brand specific:



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