Trailer Brake Controller Installation - 2008 GMC Sierra

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How to Install a Trailer Brake Controller on a 2008 GMC Sierra


Today on our 2008 GMC Sierra we'll be installing the Tekonsha Prodigy P2 Trailer Brake Controller, part number 90885. See here this is our manual override. NC, that means there's no trailer connected to our truck. On this side you have your knob that adjusts the power for your brake controller and the button on top, that will change the boost level of your trailer brake controller. The boost adjusts how aggressively your brakes come onto to your trailer, depending on the size of your trailer and the weight you are hauling. Now we'll go ahead and hook our trailer up and test out our brake controller. We don't have a trailer plugged, in so it'll be no connection.

Once we plug our seven way from our trailer into our truck, you'll see a dot come on. We're hooked up and we're ready to hit the road. To start our install for our brake controller we'll go ahead and go underneath the dash. This truck is equipped with a seven-way and has factory harness here for our brake controller. If you look here at the wiring harness underneath the dash you'll see your OBD2 port and your brake pedal right there, there's a bundle of wires. There is some electrical tape holding this bunch together and you'll see there's a light blue, dark blue, red, white and orange wires.

Just go ahead and trim the electrical tape back a little bit and you can get access to those wires and you can go ahead and pull them down and we can start making our connections to the wiring harness for our brake controller. As you can see right here, once you get those pulled off the ends of them have tape on them and those will be the wires that we'll hook our new brake controller wiring harness to. Once we finish everything up, we can go ahead and tuck these up there and zip tie them up out of the way to go back to the factory look. Here we have our wiring bundle from our truck, that comes from the factory. You have your orange wire, your light blue wire, a dark blue wire, a red wire with a black strip and a white wire. The white will be ground, the red and black will be power, our dark blue will be our signal from our brake controller back to our trailer brakes and the light blue will be the signal from our brake pedal on our truck to our brake controller. The orange is just an auxiliary and we will not be using it.

I'm going to go ahead and trim these wires off here, strip them back and we can start adding in our wiring harness from our P2 Brake Controller. Now that we have our wires stripped back, we can go ahead and add our butt connectors to this side. We'll go ahead and use a yellow butt connector that comes with our P2 Brake Controller to the red wire. We'll also use a yellow butt connector for the blue wire. Those are larger gauges than the other two, so we'll use these butt connectors. Now that we have our butt connectors on the truck side, we can go ahead and bring in our new wiring harness for our P2 Brake Controller.

Now we can go ahead and start making our connections for our wiring harness. White will go to white for our ground. The dark blue coming from our brake controller wiring harness will go into the dark blue on our truck side. The red coming from our P2 Brake Controller harness will go into the light blue with the white stripe on our truck side and our final connection will be the black wire coming from our P2 Brake Controller harness, that will go up to the red wire with the black stripe and that will be the power for our brake controller. Now that we have all our connections crimped down, I'm just going to go ahead and take some electrical tape to bundle up our wires and to protect our connectors underneath the dash. Now we need to go ahead and mount our bracket for our brake controller. Right over here, if you go down to the dash, it's right next to this pocket here, seems to be a good place to mount your brake controller. It keeps it out of the way so you don't hit your leg on it, there's not a lot of room here on the knee bolster. We're going to go to the edge of this panel right here, they have this nice mounting location for our bracket and then we can install our brake controller. We need to just pre-drill out a little bit, it does make it a lot easier to get it started to get your bracket into place. We'll just leave that one loose, then we'll snug it down the rest of the way once we get our other screw into position. You do want to make sure that your bracket is in line with your truck so your brake controller is straight. Now that we have them both started, we can go ahead, I like to take a screwdriver, just to snug them down the rest of the way. Now we can go ahead and take our wiring harness and route it over to our bracket. Once we get everything hooked up, we can go ahead and zip tie our excess wire underneath the dash. Next we'll go ahead and bring in our P2 Brake Controller and plug it into our harness and put it in position and mount it. Now we'll do the other side and install the screw there. Now that we have our brake controller hooked up, we can go ahead and zip tie our wires up underneath the dash to clean up our install look and to keep them out of the way. Now that we have our wires zipped tied up out of the way, we can go ahead and take our cutter and cut the excess zip tie off to clean up our install look. Now we need to go ahead and go underneath the hood of the vehicle and hook up two wires that come from the factory. They have ring terminals on them and there are studs underneath the fuse panel, one will be for your 12 volt constant power and one will be the power for your brake controller. If you look at our wiring harness, you'll see a red wire with a black stripe that's taped to our factory harness. Go ahead and cut the electrical tape back, grab it, once you get a hold of it and then pull it up and you can see it has a ring terminal on it and we can go ahead and put it on on stud here in our fuse box. We can go ahead and take a flange nut. You will have to provide one of these. Once you get it on there, you can go ahead and snug it down. You can use a socket, we're just using a 10 millimeter ratcheting wrench here to tighten down our flange nut. It's whatever is convenient for you. Now that we have this wire hooked up here on the smaller stud, that will be for our 12 volt hot coming from our seven way. Now here if you go directly next to the fuse box, there's another bundle of wires and there will be another red wire taped to it that has a ring terminal on it. We'll go ahead and trim that and then hook it to the other stud. That will be the power for your brake controller. Then we'll go ahead and use a larger flange nut for this stud. Now that we have our two wires underneath the dash tightened down with our flange nuts, we can go ahead and reinstall our cover that covers up our fuse box. Now that we have our power hooked up to our brake controller, we'll go ahead inside our truck and check it to make sure everything's working correctly. Now that we have our wires hooked up underneath our hood, as you can see, we have power to our brake controller. Now that our trailer's hooked up we can go ahead and hit the road. That will do it for the Tekonsha Prodigy P2 Trailer Brake Controller, part number 90885 on our 2008 GMC Sierra. .


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