[hertfordnc]

I have a 2003 3500. The the trailer brake wire harness was still in the wrapper.

I connected it under the dash and wired my cheap reese controller to it per the instructions.


Here's what I have- four wires coming form the trucks brake harness.

1- input from brake pedal
2- 12 VDC
3- ground
4- output to trailer brakes.


So, with the engine on when i press the brake pedal i should have power to wire number 1, right? It sends the signal to the controller which sends power out to the trailer brake, right?

Anyway, when i press the brake i get no power to the brake signal input wire. I do have 12 VDC on the power wire and the ground is good.

My other option would be to go old school and wire it right to the brake light switch but there are a dozen wires on the switch at the brake pedal and I don't know which goes hot when the brakes are applied.

Thanks

 

[Thor99]

The brake wire should be in that plug.....but the white wire with a tan stripe at the brake pedal switch is the signal wire when the brake pedal is pressed.

 

[hertfordnc]

The brake wire should be in that plug..
.

THanks. There is a wire that says "brake input signal" (i think) So I'm thinking it should have 12 VDC, or some voltage, when i press the brake pedal, But it doesn't. The other three wires on the harness work as labeled

 

[redneck733]

Check and see if you get power too the brake signal wire when you apply the brake control switch.

 

[greenenvy1]

IIRC the trailer needs top be plugged in for this to work. Have you tried that?

 

[hertfordnc]

THanks. I'm sick today so I can't go out and mess with it but I will double chack all these suggestions.

My assumptions was that when i pressed the brake pedal I would get voltage at the wire labled "brake input signal" But I can't remember if i had everything connected when i opened it up to meter it.

WIth 12V to the controller I can maually push hte switch on the controller and send power to the brakes.

 

[brads04cummins]

Any fix? I have a 04 all fuses and bulbs are good but can't get my controller to work. The 3rd brake light doesn't work when the pedal is pressed but it does work when I manually press the controller. I have replaced the brake switch also. I'm about just direct wire it. Will the lowers rails handle the extra load? I don't want to be blowing fuses all the time. Going to by a 5th wheel soon and I need a fix