Trailer Brake Controller Installation - 2011 GMC Sierra

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How to Install a Trailer Brake Controller on a 2011 GMC Sierra


Today on our 2011 GMC Sierra, we're going to install part number 90885 from Tekonsha. It's a Prodigy P2 Brake Controller. First thing we need to do is go ahead and locate the wire harness underneath the dash of the truck. Also, there's a small flag that helps identify the wires for it. It usually comes off the wire harness. In this case, it was stuck to a different wire harness but we pulled it out and away so you could see it.

Now there are five wires on this harness but we're only going to use four. You'll notice we'll have an orange wire that's left over. We're going to go ahead and take our wire harness that comes with the brake controller and hook it up to the wires underneath the dash. We'll start off with our power supply wire, that's going to be a red wire with a black stripe. That's going to hook up to our black wire. Next, we'll go ahead and hook up to our ground wire.

That's going to be all white on the truck and it's going to be all white on our brake controller harness. We'll connect those two together. Alright, next we'll go ahead and look for our brake controller signal. This case we're going off the wire harness in the truck, we're going to use blue with a white stripe. That's going to hook up to our small red wire on our brake controller wire.

Then we're going to hook up our blue wire on our truck to our blue wire on our brake controller wire. After our connections are made, we'll go ahead and keep them together with electric tape and secure our wires. Then we'll go ahead and start working on our bracket for our brake controller. Now underneath the dash, we're going to use a pre-existing assembly screw. We'll go ahead and undo it, then run it through our pocket that's going to hold our brake controller. Then we'll go ahead and reattach the screw and the pocket back to underneath the bottom of the dash.

You'll take one of the sheet metal screws that comes with the brake controller kit, we'll go ahead and run that into some plastic that's right next to the other screw. Once the bracket's secure, we can go ahead and take our wire harness, run it through the back side, and plug into the back of our brake controller. Once it snaps into place, we'll go ahead and take the brake controller, then snap it into the pocket. Now's a good time to take a few moments to go ahead and zip tie our wires and make sure everything is safe, and secure, and out of the way. Next, we need to go underneath the hood to hook up our power supply for our brake controller. The power supply is located next to the power junction box between that and the fender well. Now that's a tight area so we're actually going to use a piece of wire with a hook on the end to help pull our wire up and free it up. Now we also need to pull the cover off the junction box. Then there will be a lug that we can attach our wire to. We'll go ahead and put it over the lug and then we'll go ahead and attach it with a nut. Now this nut does not come with the brake controller. We'll be using part number 185917. We'll go ahead and tighten it down and we'll have power to our brake controller. Now while we're here, it's a good idea to go ahead and took our 12 volt power supply for a seven pole connector at the bumper. Lower down in the engine compartment, by the front suspension, you'll see some red wires wrapped around a harness with some tape. We'll go ahead and pull it free as well. We'll go ahead and take that wire and hook it up to our junction box and that will use a different size nut. That will be part number 185916. We can go ahead and re-install our cover for our junction box and check for power at our brake controller. Right off the bat, we should see two dots. One will show power and one will show that the boost is on. We should also see an "NC," for "No Connection." Now we'll go ahead and plug our trailer into it and we should see a "C," for "Connection." We'll move the manual override lever on the bottom and we can see how the numbers go up and down so that works. We'll also hit the brake pedal and we should see a small amount of number show up. In this case, looks like 2.1. Now this number will rise if you're moving and then hitting the brakes at the same time. If everything's working, that will finish it for our install part number 90885 from Tekonsha, the P2 Brake Controller on our 2011 GMC Sierra. .


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