help electric brakes
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Elder User
Joined: Oct 2006
Posts: 874
Likes: 4
From: mckenna wa
help electric brakes
I have a 2003 f-250 6.0 when i bought the truck the electric brake light dident come on ever. I have 12v at the red power wire and the blue brake wire. So i bought a new brake controller and wired it in like it said. I still have no light on my controller box. i also replaced the rear 7 prong reciever and cleaned out some corrosion on the plug. i have 12v at the brake controll wire at the back plug all the time. I believe that is how its supose to be. I also took a new wire and ran a temp ground to the battery to see if that was the problem still dident work. Has anyone had this problem or can anyone help me I need to cut wood in the morning and i cant get this fixed alone. Thanks for all your help.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
It's been a while since I've done one, but I thought the color code was
Blue=Trailer
Red=Brake switch
Black=Power
White=Ground.
Check your controller to verify, but you should only have power one the black wire when the pedal is not pressed. When the pedal is pressed, then you should see voltage on blue, black and red. Think of it as a big relay. When the red wire has 12v, current should be available on the blue wire. When the red wire isn't powered, the blue wire should be cold.
Blue=Trailer
Red=Brake switch
Black=Power
White=Ground.
Check your controller to verify, but you should only have power one the black wire when the pedal is not pressed. When the pedal is pressed, then you should see voltage on blue, black and red. Think of it as a big relay. When the red wire has 12v, current should be available on the blue wire. When the red wire isn't powered, the blue wire should be cold.
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Elder User
Joined: Oct 2006
Posts: 874
Likes: 4
From: mckenna wa
thanks for the reply. I have the paperwork here. it says the ford harness red is 12 v and it hooks to black the light green on the truck is stoplight and it hooks to the red. white ground. dark blue is trailer brakes and it hooks to the blue. There is a brown wire which is marked illumination on the harness, but here on the diagram for the controller box says its N/A.
Hotshot
Joined: Feb 2003
Posts: 11,537
Likes: 27
From: Long Beach, Ms.
What controller? Have you tried with a trailer that you know is good? Or has all your work been with the same trailer? The brake activation wire at the rear will show increasing voltage as the need for braking power increases.
Thread Starter
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Elder User
Joined: Oct 2006
Posts: 874
Likes: 4
From: mckenna wa
Thanks for your help. I have a voyager xp. Will the light on the electric brake controller not come on if the trailer is not wired rite? That is whats confusing me i thought it was always on?
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
All of the ones I've used the light would turn on when the brakes are pressed. Some get fancy and change colors if there is a problem, but the lamp should light if you have voltage on the lt grn truck wire.
Hotshot
Joined: Feb 2003
Posts: 11,537
Likes: 27
From: Long Beach, Ms.
Have you tried another vehicle with the trailer? I think that there may be a problem with the brake system on the trailer.
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Elder User
Joined: Oct 2006
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From: mckenna wa
The trailer did have some major problems but i still have 2 hot leads comming from my controll box all the time i need to find out why i have the blue and red wire with 12 volts. I am rewiring some stuff on the trailer brakes and thats giving me hell too. Do you have any idea why i would have a blue wire and red wire hot comming from the controll box and no green light?
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Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
Just that the controller is dead. The electronics have shorted and it's providing full lock to the trailer. You should be able to reduce the voltage on the blue wire with one or both of the adjusters.
Posting Guru
Joined: Aug 2007
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From: Fort Wayne, IN
Something new can always be bad out of the box. I've bought tstats that were dead on arrival. Just a few days ago I bought a card reader from my system from the place I work (i'm currently a computer technician). I've installed 300 of these card readers since last August, and had only 14 give us trouble, and that was always a few months later. The one I got was dead in the box, didn't work at all. Switched it into another system, still didn't work. Just grabbed another off the shelf, worked like a charm, instantly.
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Elder User
Joined: Oct 2006
Posts: 874
Likes: 4
From: mckenna wa
Thanks for all the help guys i got it figured out it took some doing though. the trailer brakes were wired wrong. also the brake controller i had in the truck when i bought it a few months back was bad along with the new one i bought, it was also toast. i pulled a 10 year old one out of my 85 just because everything pointed at the box and it was the box. Thanks again for all the help.
Duke jr.
Duke jr.