Wires coming from the cab

The_Eman · Post by **The_Eman** » Thu Aug 16, 2007 5:05 pm

I have two wires coming out of the back drivers side cab of my truck towards the bed. They've been cut and I don't their purpose. Any thoughts?

1968 F100 Ranger.

gbrett · Post by **gbrett** » Thu Aug 16, 2007 9:01 pm

they dont sound factory to me

Post by **FORDification** » Fri Aug 17, 2007 12:21 am

There aren't any factory wires which exit the back of the cab.

Blue Cloud · Post by **Blue Cloud** » Fri Aug 17, 2007 7:12 am

Sounds like the PO had wired in lights for a topper maybe. Don't you hate mystery wires!

The_Eman · Post by **The_Eman** » Fri Aug 17, 2007 9:54 am

Thanks for the responses. Yes I hate mystery wires. I also hate this mystery box I have that that has engergize written on it and it is connected by a jumper from the brake light wires.

I'll take a pic and post of that .

Post by **FORDification** » Fri Aug 17, 2007 10:53 am

That sounds kinda like it might be a trailer brake controller? Does it look sorta like this?

If that's what it is, it'll have a steel brakeline coming out of the back of the box and going through the firewall to connect to a tee fitting at the master cylinder.

kid · Post by **kid** » Fri Aug 17, 2007 4:43 pm

My trailer brake control is down on the side under the Parking Brake release. Yours is where my missing AC unit goes.

The_Eman · Post by **The_Eman** » Sun Aug 19, 2007 12:25 pm

Here is a pic of the box. Definitely not stock. Notice the arrow pointing to the left. One can slide that portion to the left. The slider doesn't stay in the "left"/"moved" position. The slider immediately returns to the orignal position.

Any thoughts?

gbrett · Post by **gbrett** » Sun Aug 19, 2007 2:36 pm

thats an electric trailer brake controler

kid · Post by **kid** » Sun Aug 19, 2007 5:23 pm

I thought so too when I saw Kelsey on the Box, Kelsey prior to Kelsey Hayes made trailer brakes. I just didn't want to say anything until I looked it up.

Thunderfoot · Post by **Thunderfoot** » Sun Aug 19, 2007 11:29 pm

gbrett wrote:thats an electric trailer brake controler

gbrett is correct.

I have used that same trailer brake controller in a couple of my trucks. It will have a wire connected to the Brake lights to activate the controller and uses a inertia pendulum inside it to control how hard it applies the brakes. This style has no need to be plumbed into the brake hydraulic lines...
The slider is for manual operation..

my460pjb · Post by **my460pjb** » Wed Aug 22, 2007 7:56 pm

Thunderfoot wrote:
gbrett wrote:thats an electric trailer brake controler
gbrett is correct.

I have used that same trailer brake controller in a couple of my trucks. It will have a wire connected to the Brake lights to activate the controller and uses a inertia pendulum inside it to control how hard it applies the brakes. This style has no need to be plumbed into the brake hydraulic lines...
The slider is for manual operation..

Thats right with no doubt

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