Brake control box

[Gushatman]

On a 1999 SD is there a wiring harness in the cab, for a plug & play method with the brake control box, or do you have to hard wire it in?

[thbd77]

yes there is....you can buy the plug at the dealer about $20 ...under the dash in the middle

[MrJohnWayne]

remove the fuse panel cover and it is just inside the dash bracing under the radio

[Midwestern4x4]

Originally Posted by MrJohnWayne

remove the fuse panel cover and it is just inside the dash bracing under the radio

In the photo of yours there is a few wires not connected to anything. Mine has the same ones , wonder what they are for.

[Piraya33]

I just installed a Tekonsha P3 brake controller this past weekend. I got a harness from my local hitch store for $8 and plugged it into that gray plug. It had pigtails on the other end with four wires (blue, black, white, and red). I just matched the wires up with the wires on the brake controller harness and walla, brake controller works. I will get some pics tomorrow for you. It was VERY easy to do, don't pay anyone to do it!

[mas360]

Originally Posted by Piraya33

I just installed a Tekonsha P3 brake controller this past weekend. I got a harness from my local hitch store for $8 and plugged it into that gray plug. It had pigtails on the other end with four wires (blue, black, white, and red). I just matched the wires up with the wires on the brake controller harness and walla, brake controller works. I will get some pics tomorrow for you. It was VERY easy to do, don't pay anyone to do it!

I just did mine with an adapter ordered on line for $15 including shipping. Discount Hitch in town wants $25 for the adapter plus $98 for labor to install it. That is before sales tax....