Trailer Brake Controller Installation - 2012 GMC Sierra

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How to Install a Trailer Brake Controller on a 2012 GMC Sierra


Today on our 2012 GMC Sierra, well be installing the Tekonsha Prodigy P2 Brake Controller, Part Number 90885. To begin the install, well first go ahead and locate the manufacture's brake controller pigtail. This pigtail will be taped to the main wiring harness near the brake pedal. Once we locate the wiring, well go ahead and pull it down to gain access to it. Now, there are a total of five wires. However, we will not be using the orange wire, just the red with the black tracer, blue with the white tracer, and white wire. Now, well go ahead and pull the wires down, and cut them out evenly the length. Then well strip each one of them back, and add a butt connector supply with the brake controller. Now, with butt connectors on the manufacture side, well bring in the brake control pigtail, which is supply with the brake controller, and start connecting our wires.

From the manufacture side, the blue wire will match over the blue wire on the brake controller pigtail. Next, on the manufacture side, the red wire with the black tracer will be the power. It will match over the black wire on our brake controller pigtail. Now, with the manufacture blue wire with the white tracer, is the brake switch signal that will match in with the red wire on the brake controller pigtail. The white wire on the manufacture side will match over the white wire on our brake controller pigtail. Now, with all four wires connected and secured, well go ahead and wrap it out with some black electrical tape to help the connection points stay clean from dirt, dust, debris, and moisture.

This will also assist in bundling up our wires to clean and get up our install look. Now, with the pigtail and connection points wrapped up with the black electrical tape, well go ahead and leave it here and move over, and mount the brake into our bracket. The bracket is supplied with the brake controller along with the install screws, and take the screws and bring them here into the bottom of the dash to secure the bracket. Once the bracket is secured, we can go ahead and take the pigtail wiring and plug it into the back of the brake controller. We'll then take the brake controller and attach it to the bracket using the screws provided. Now, with the brake controller secured, well go and take the wiring and tip tie it up underneath the dash to secure it to make sure it stays out of the way from any moving components, such as steering shaft to brake pedal. We'll cut off the excess in the zip ties to create a brand install look. Now, were going to move underneath the hood.

We'll need to connect the hot lid for to the brake controller. First, well move the fuse box cover. Once we set the fuse box cover aside, between the fuse box and the driver side inner fender well is the hot lid take to the manufactures harness. Once we locate it we can cut the tape and pull the wire free. Now, were ready to install the ring terminal unto the posts. Give ourselves a little working room, well go ahead and unlock the handle here for the fuse box and just raise it up enough that we can get the ring terminal unto the posts, enough to get a tool in to tighten it down, or run the wire over to the empty post at the front of the fuse box. The ring terminal at the wire will match up identically with this posts.

To secure the ring terminal to the post, we use the 8 millimeter nut, part number 185917. Install it finger tight. Once we have installed it finger tight. well go ahead and snug it up, and reinstall the handle. Now with the handle reinstalled, well go and take a zip tie to secure our wiring if necessary, cut the excess of a zip tie, then reinstall the fuse box cover. With the fuse box cover now on, lets go ahead and go over the function of our new brake controller with just the two lights showing on the display will indicate power to our brake controller. Once we connect the trailer wiring, it will show a C for "connection." Once we disconnect it, it will flash NC for "no connection." Now that we know our brake controller works were ready to hit the road. That does it for the install of our Tekonsha Prodigy P2 Brake Controller, part number 90885 on our 2012, GMC Serria. .


Questions and Comments about this Video

Roger W.

Does the controller stay energized all the time, and will it drain my battery? 4429

Reply from Patrick B.

The controller will not stay energized the whole time. After a period of no movment, once the truck is parked, the controller will shut down. As soon as the internal sensor detects movement, it will power back on. Typically it's 15-30 minutes before power down which isn't long enough to drain a noticeable amount of power. They work this way to ensure the driver never forgets to turn on the controller and the controller never drains the battery. Even opening and closing the door will cause enough movement for the controller to power up. 3471

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