Plug In Tow Bar Wiring and Trailer Wiring Harness at the Same Time on a 2017 GMC Terrain

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Question:

I currently tow a 2017 GMC Terrain with a wiring harness provided by you. Code No. HM56108. I want to tow a small trailer and would like your recommendation for a trailer wiring harness and how to connect it with the HM56108 installed. I will not tow the Terrain and trailer at the same time. Thanks for your help

asked by: Kenneth J

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Expert Reply:

You can install trailer wiring harness # 118494 on your 2017 GMC Terrain between the tail lights and the tow bar wiring harness # HM56108 that you already have installed. So basically you will unplug the HM56108 harness, plug in the 118494 connectors to the lights, then plug the connectors from HM56108 to the 118494 and then to the other vehicle connectors that lead to the front of the vehicle.

expert reply by: Michael H

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Answer 1

High William; we haven't had an F-150 come in for installation with the Active Air Dam so we don't have it in an installation video. I went ahead and attached a picture of the #EH87SR instructions below showing what the process is like. It is…

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Answer 2

The Hopkins #HM40975 that you referenced plugs into a US Car Connector (see attached picture). This typically will replace a factory 7-Way on a vehicle so if your 2015 GMC Acadia didn't come with a 7-Way you might not have that connector. If it…

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Answer 3

Hi John; we actually have both a hitch and wiring available for your 2025 Toyota RAV4 Hybrid XLE Premium. I recommend the following: -TowSmart Trailer Hitch Receiver #TS42VR OR -Oris Hitches Detachable Hitch #TS66VR -Curt T-Connector Vehicle Wiring…

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Answer 4

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 5

Yes, the Curt wiring harness part #56094 is a confirmed fit for your 2015 GMC Terrain and would work well. I attached an install video for you to check out as well.

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Answer 6

Yes, the Curt hitch part #e98865 is the correct fit for a Class III 2-inch hitch for a 2017 Chevy Equinox. I attached an install video for more info on this hitch for you to check out as well. If you wanted to do some towing you might be interested…

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Answer 7

Hi Scott; a hitch designed to fit the F-450 will not fit the E-450. There are frame differences that won't allow it. You will need a universal hitch for that vehicle like the #41990-07 (7" brackets) or #41990-16 (16" brackets). This is…

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Answer 8

Yes. In fact all of the trailer wiring harnesses for the 2016 Chevy Equinox plug into the vehicle. You can use Tekonsha trailer wiring harness #118494 to add a 4-Way flat connector to the rear of the vehicle. I have included a link to a video showing…

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Answer 9

Dirty and rusted weld nuts are actually not too uncommon, in fact we have a dedicated article on exactly this subject that I have attached. You will want start by cleaning them out with a spray lubricant (WD-40, etc) and a simple wire brush. You may…

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Answer 10

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 11

We have everything you need to pull your new GMC Terrain or Chevy Equinox behind your RV with all 4 wheels on the ground. To do this you will need a base plate kit, a tow bar, safety cables, a lighting solution, and a supplemental braking system.…

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Plug In Tow Bar Wiring and Trailer Wiring Harness at the Same Time on a 2017 GMC Terrain

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