Ruralgural, my sincerest appologies. I fat fingered your topic and accidently deleted it. I was able to save this much of the discussion with a cut 'n paste. I suppose I'll have to rake out your stalls for the rest of the week now!

horsepuller, your fumble fingered moderator

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Ruralgural
User since 31-Jul-02
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Non-member "Wiring brake controller"
31-Jul-02, 10:12 PM (EST)

I have the electric controller for my horse trailer's brakes in place. It plugged right into the socket under the dash. I have the lights plugged into the socket in the back. Now how do I get the electricity from the front of the truck to the back of the truck? I found a plug with 4 round male ends under the hood. Is there something that plugs in here and goes back. Two of the wires are hot 12 volt, the other two are dead. I need to wind up with a black, blue, and yellow to plug into my 7-prong RV plug. The truck is a 1994 F-150 extended cab. Can anyone help?


kbmc4
User since 3-Jul-02
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Non-member 1. "RE: Wiring brake controller"
01-Aug-02, 07:03 PM (EST)
LAST EDITED ON 01-Aug-02 AT 07:05 PM (EST)

you should be setup the truck should have a big Black plug at the back of the truck underneath the drivers side check and see if you have this plug if not let me know
Bryan


Ruralgural
User since 31-Jul-02
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Non-member 2. "RE: Wiring brake controller"
02-Aug-02, 03:19 PM (EST)

We put the plug on ourselves, the problem is that there aren't any wires to connect from the trailer brake controller to the plug.


kbmc4
User since 3-Jul-02
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Non-member 3. "RE: Wiring brake controller"
02-Aug-02, 05:21 PM (EST)
LAST EDITED ON 02-Aug-02 AT 05:24 PM (EST)

If your truck has the plug under the dash it should have the blue wire running to the back of the truck also everyone that i have seen was set up this way if it does not have the plug under the dash you will have to run wires and I can help you with that=== there may be a blue wire bundled up around the wire connection at the back of the truck around where the wire fron the front of the truck splits and goes to the right and left tail lights
Bryan

 

im having the same problem. i have a 94 ford f150 reg cab 4x4. it has the plug for the wiring under the dash but i cant find the blue wire at the back of the truck for my trailer brakes and also cant find the 12v hot wire to go to the trailer brakes

 

You won't find them unless you have the trailer tow package .
Green -Right turn
Yellow- Left turn
Brown- Tail lights
White- Ground
Thats the 4 flat basic wiring
Blue- Trailer brake
Red - 12v
Purple- Back-up lights
Thats all for the 7 pin round with tow package

If you don't have a factory 7 pin on the back you can try a bone yard and grap a factory one and it( MAY ) plug into the factory harness
If not you will have to run the red and blue back to the plug.

 

Was that plug under the dash one with four pins (two rows of two) or six pins (one row of three, one row of two with a blank)? I've never seen a six pin type that hasn't been run back to at least the driver's side frame rail near the spare tire. That was how my 1998 F150 was. I just bought the last section of harness for a truck with the trailer towing package and was done with it. That may or may not hold true on a 1994, since that is a different generation truck.

The four pin ones are a tossup. Some run down the frame and many do not and will quit right there at the big terminal block inside the cab near the pedals.

All the plugs will get you a good ground and get you the brake switch signal, which saves you from worrying about the ABS system. When I wired the old 1992 F250, which had the four pin plug under there but no wires to the back, I used the plug for ground and brake switch and ran the other brake control output line and 12v line myself.

 

Incidentally, that 12 volt hot that's supposed to go to the back will only work with the ignition in the ON position. Also, if you don't have the trailer towing package, Ford might have left out your trailer battery charge relay. That would show up in your power distribution box under the hood. The trailer tow also gives you a trailer backup light relay in there.

 

the plug is under the dash and the fuses and relays are factory wired and installed but just no connectors to the back of truck. So, all i would have to do is run the blue wire myself and connect to vehicle side of trailer plug? would i have to do the same for the 12v red wire? and if so could i just run a fused wire from the battery straight back to plug? it has the 6 pin connector under the dash. i was needed to hook up a 6 round trailer plug

 

It's funny that you would have all the relays there and the under dash plug but no factory back plug...oh well.

Actually, that sounds like what I had on my 98. You might try taking a peek at the harness down the driver's side frame rail near where the spare tire is and see if you've got the two wires run up to there. That would save you running it down the entire frame rail, anyway. You could either splice in on the one side of that connector or try and find the connector from Ford or a yard.

Like I said, the 12V wire will be Orange and the Brake Controller Output Wire will be Dark Blue if you've got them back there. If that plug under the dash has power and everything, I'm thinking that they ran it at least some of the way down the frame already.

Best of luck, and let us know how it turns out.

 

ive traced it from the firewall all the way to the back with no luck. then i found that the blue wire goes to the plug at the firewall but i pulled the 2 plugs apart at it doesnt go through to the motor side of the firewall, same with the 12v hot wire. i think im gonna have to run the brake control wire and the 12v hot myself all the way back off of the plug under the dash. can i run a fused 12v hot off of the battery back there for the power? everything works on the controller, if its working right does the truck brakes come on if you manual engage the controller?

 

No, the manual slide only activates the trailer's brakes.

Steve

 

i meant to say does the truck brake lights come on?

 

No again, it only shoots 12v to the trailer's brake magnets.

Steve

 

Ohhhhhhh Mine do


If i use the manual slide on the brake control my brake lights come on but thats the factory wiring.

 

There's nothing wrong with running a fused line directly from the battery to the 12V+ pin on your trailer socket at the back of the truck.

Ford did that relay and key on thing with the factory wiring to make it harder for people to run the truck battery dead should the owner do something silly like leave the loading lights on all night with their horse trailer.

Have you made sure that you have 12V power at the plug under the dash for your brake controller yet? You should have 12V power going into the brake controller at all times, regardless of wherher or not the key is on. The under dash plug will already have given you a good ground and the signal from your brake light switch.

 

yeah there is 12v to the controller and everything works on the controller just dont have factory wires in the back to hook to. looks like im just gonna have to run my own wires back there to hook into. thanks for all the help and info