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T-One Vehicle Wiring Harness Installation - 2017 GMC Acadia

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How to Install the T-One Vehicle Wiring Harness on a 2017 GMC Acadia


Today on our 2017 GMC Acadia, we'll be having a look at the Tekonsha T1 Vehicle Wiring Harness for factory tow package and it will give us a 4-pole flat trailer connector. Part 118720. As you see we have plenty of room to connect to our trailer. When we're not using our wiring, we can just take the included dust cover here, slide it over the safety chain loop on our hitch and re-secure your wiring. It's up and out of the way. Here's what our trailer wiring comes with. As you see, very simple kit here. We have our factory tow package connector right here.

Plug in behind our bumper cover. Nice, decent length of wire. This is actually almost more than what you need. It gives you plenty to work there. At the end, we have our 4-pole flat trailer connector, with an included dust cover that's built onto it.

Just close that up here right now. We're not going to be needing that right now. Now, this will give us our basic lighting functions on our trailer that we need to legally tow a trailer down the road. It will give us our tail lights, our running lights, our brake lights, and our turn signals. We also have a hardware kit that's included. This is a self-tapping screw that's in this bag. You don't need that at all for the installation.

This is just a generic hardware kit that comes with them We have two zip-ties to secure our wires up underneath the vehicle. Now that we've gone over what's included in our kit, we'll go ahead and show you how to install it on our 2017 GMC Acadia. We're going to start by removing our fascia door, right here. There's 2 7-millimeter screws that hold it on. There's one on both sides of our fascia door. We'll set this aside. Now, we'll undo our fascia support screws. There's one on both sides of where our fascia door was. With our hardware now removed down below, we can come up, open our hatch and remove our hardware inside the hatch area.

On both sides of our hatch, there are 2 T-15 screws we'll remove. Take off this plastic thing here too, so it doesn't fall. We'll set these aside. Now, we'll pop off this black cover here. You can use a flat-head screwdriver or a trim panel tool. Behind that, you'll find a 7-millimeter bolt. There's one on both sides. We'll go ahead and remove that one, too. Now, we'll repeat the same process on the other side. Now, we're on our passenger-side of the vehicle in the rear wheel well. 1, 2, 3, 4 screws that we need to remove with a T-15 driver. Now, we use a trim panel tool and we'll pry off this trim on our wheel well. Set this aside. Now, we have 2 7-millimeter bolts that hold our fascia on to the vehicle. We'll remove these. We'll repeat this same process on the other side. We'll remove our bumper cover. Just pry it off. Now, on our driver's side of our vehicle, before we walk away with our fascia, we need disconnect our wiring harness for our rear parking sensors. We'll take this black piece here, hold on to it, and we'll pull the wiring harness away. Find this red lock tab, pull it back. Press on this tab here, and work our connector apart. When disconnected, we'll pull the wiring harness off this stud right here. With that disconnected, we can set our fascia aside now. With our wiring harness in hand, we'll go over here to this connector. Pull back on this red lock tab. Push in here on this tab, and pull out this dummy plug. We'll set this plug aside. We won't need it ever again. We'll drop our wiring on down behind our bumper bar. Now we'll plug our connector in. Once it snaps in place, pull back on it and make sure it's secure. Then slide your lock tab back over. Now, before we reinstall our bumper cover, it's a good idea to test our wiring, and make sure it all works. Right now, we have our headlights on, and you can see that the red LED that corresponds to the brown wire in our tester is illuminated. That means our tail lights will work on our trailer. Try our left turn signal. You see the LED that corresponds to the yellow wire is flashing. Do the right now. The LED that corresponds to the green wire is flashing. That means our turn signals will work on our trailer. Go ahead and step on the brake. You can see both LEDS are on solid for the yellow and green wire. That means our brakes will be working on our trailer. Now, I have an extra set of hands, we'll put our bumper cover back in position. First, we'll make sure we re-install our wiring harness here. Plug it back in. Once you hear it snap and you can't pull back on it, you know it's secure. Slide the locking tab back down. Push this back under the stud. Push the other wiring under the stud down here too. We'll slide it back around our tail lights. Push in on the fender so it snaps in. We'll re-install our hardware to hold our bumper on now. Repeat the same process on the other side. Re-install our screws. Slide our trim piece back on. There's a tab that goes into the fascia on this notch right here. You insert that into there. Then line your guide pins back up, and snap it back in place. We'll re-install our 4 screws. Okay, with all of our 4 screws re-installed, we'll go repeat the same process on the other side. With our install complete, we can now remove our strap that we used to support our exhaust. That completes our look at the Tekonsha T1 Vehicle Wiring Harness for factory tow package with a 4-pole flat trailer connector. Part number 118720 on our 2017 GMC Acadia.


Info for this part was:

Employee Andrew K
Video by:
Andrew K
Employee Zach D
Video by:
Zach D
Employee Jonathan Y
Video by:
Jonathan Y
Employee Thomas T
Video by:
Thomas T
Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Brent H
Test Fit:
Brent H
Employee Robert C
Test Fit:
Robert C
Employee Conner L
Test Fit:
Conner L
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G

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