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Trailer Wiring Harness Installation - 2008 Toyota Highlander

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How to Install a Wiring Harness for a Trailer on a 2008 Toyota Highlander

Today on this 2008 Toyota Highlander we will be installing the wiring harness part number 118449. The first thing I want to point out with this wiring harness before we get started is that it does come in two pieces. The larger piece with the larger 10 pin port is going to plug in underneath the dash on the interior of the vehicle. The second part which contains our 4-pole end is going to plug… see more >     



After installing how do you plug into the trailer?

Etrailer Expert

Rachael H.


The 4-way flat portion will be routed outside the vehicle and will plug into the trailer side connector. I realize this video did not show that final step of the installation but I have provided a link to another one of our videos that shows the installer testing the side connector that would plug into the trailer wiring harness at about 6 minute and 35 seconds of the video.

Info for this part was:

Employee Zack K
Video Edited:
Zack K
Employee Andrew K
Video Edited:
Andrew K
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Jeff D
Installed by:
Jeff D
Employee Cole B
Installed by:
Cole B
Employee Nicholas E
Test Fit:
Nicholas E
Employee Randy B
Test Fit:
Randy B
Employee Brent H
Test Fit:
Brent H
Employee Shane H
Test Fit:
Shane H
Employee Robert C
Test Fit:
Robert C
Employee Andrew L
Video by:
Andrew L
Employee Kathleen M
Video by:
Kathleen M
Employee Jonathan Y
Video by:
Jonathan Y
Employee Michael B
Video by:
Michael B

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