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Trailer Wiring Harness Installation - 2018 Chevrolet Silverado 1500

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How to Install the Trailer Wiring Harness on a 2018 Chevrolet Silverado 1500


Today on our 2018 Chevrolet Silverado, we're going to be taking a look at and showing you how to install the Tekonsha T-One vehicle wiring harness with four-pole flat trailer connector. That's part number 118384.Here's what our wiring looks like once we have it installed. It is going to provide us with a four-pole flat trailer connector so we have all the required lights to get down the road safely, like our taillights, turn signals, and our brake lights.The nice thing about our wiring is that we're not going to have to cut or splice into our factory wiring at all. It's going to have a simple T-connector that's going to plug in behind the bumper. If you have the factory seven-way, we're still going to be able to retain that function while adding another four-pole connector so we can hook up to multiple trailers. Our wiring is going to have loom protecting our wires and also help hide some of those colors while it's on the back of the truck.

It is going to have an included dust cup, will keep all the dirt and grime out of the connector. We can also use it to hang it off our safety chain loop.To begin our installation, we're going to come to the back of our Silverado, and right here at the bumper we're either going to have a seven-way plug or just this dummy plug that we're going to come right behind it underneath the bumper. Now on the back we'll have our wiring and we'll have this gray keeper tab. We're going to want to pull that out and hold onto it, but then we'll find the black tab underneath. We'll press it and we can pull our wiring out.

Then we can grab our new harness. Going to put a little bit of dielectric grease inside the connector. Hopefully that'll prevent any kind of corrosion from building up and moisture from getting trapped inside. We'll fill up the cavity. Then we'll plug it into the plug that we removed.

Then we'll take that keeper tab and we can put it back in place. We'll make sure it doesn't come undone. Then we take the other end of our connector and we're going to plug it back into the plug we removed it from. Make sure it locks in. Then we'll route our four-pole over the hitch so it'll by the receiver tube.I'm going to use my dust cover as a keeper to hold my four-pole up a little bit so I can see how much slack I'm going to need to tie up.

Then we just take some of the included zip ties and tie it to the hitch behind there.I went ahead and plugged in my four-pole tester so I can make sure that all the circuits are working properly. If you need one of these, you can pick one up here at etrailer.com using part number I26. We can see that my taillight function is working properly as well as the left turn signal and the right turn signal and my brakes. All we have left to do now is hook up to our trailer and hit the road. That'll finish up your look at the Tekonsha T-One vehicle wiring harness with four-pole flat trailer connector, part number 118384, on our 2018 Chevrolet Silverado.


Info for this part was:

Employee Zack K
Video Edited:
Zack K
Employee Jeff D
Video Edited:
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 Andrew K
Video by:
Andrew K
Employee Kathleen M
Video by:
Kathleen M
Employee Zach D
Video by:
Zach D
Employee Jonathan Y
Video by:
Jonathan Y
Employee Nicholas E
Test Fit:
Nicholas E
Employee Randy B
Test Fit:
Randy B
Employee Brent H
Test Fit:
Brent H
Employee Robert C
Test Fit:
Robert C
Employee Ryan G
Installed by:
Ryan G

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