Troubleshooting 4-Way Wiring Relays Wont Install on 2018 GMC Terrain

Question

Question:

I have a 2018 terrain. I installed the wiring harness per video but the relays dont snap into the block. What else do I need?

asked by: Roy

0

Expert Reply:

It sounds like you're installing the Curt # C56375 on your 2018 GMC Terrain. This is designed for the factory tow package. Since your relays don't snap into the K1 and K3 positions it sounds like the terminals are missing from the relay cavity. This means you need the T-One Vehicle Wiring Harness # 118764 instead. This wiring harness is designed for the Terrain without the factory tow package, and no relays are required.

expert reply by: Robin H

0

Answer 1

It sounds like there is a problem with a relay on the vehicle side. In the fuse panel located in the rear of your 2018 Chevy Equinox check to make sure there is a relay in the K3 location. Wiring harness #C56375 comes with 2 relays and one of them…

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Answer 2

There are wiring options for your 2018 Chevy Equinox Premier. If you have the factory tow package you would be able to use the Curt #C56375. If you did not have the factory tow package you would want to use the Tekonsha T-One Wiring Harness…

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Answer 3

I would be happy to help you find a hitch for your 2022 Chevy Equinox. I recommend the Curt Trailer Hitch Receiver item #C77FR. This is a custom fit hitch that bolts directly onto your vehicle without any drilling into the frame or welding. It has…

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Answer 4

In order to determine if a 2020 GMC Terrain has the factory tow package you will need to take a look in the rear fuse box on the driver side of the vehicle. In the fuse box there will be two locations you need to check, K2 and K3 which are for the…

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Answer 5

Assuming the lights and wiring on your older trailer are in good condition you will not have any issues connecting with and powering its standard incandescent lights with a tow vehicle that is equipped with LED lights. The difference in light…

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Answer 6

To find out if your 2020 GMC Terrain has the factory tow package you will need to get into the fuse compartment in the rear of your vehicle. This fuse box will be located on the drivers side beneath the window. Once inside you will want to find the…

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Answer 7

In regards to a 2018 GMC Terrain, not all models with the tow package port will actually have the tow package wiring. In other words, the port may be present but the wires are not run from this to the fuse block therefore the port is inoperable even…

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Answer 8

Due to overall brand reliability and quality, easily the best trailer hitch - and the one I recommend - for your 2024 Chevy Trailblazer is the Curt Trailer Hitch #C94UR.

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Answer 9

The Curt Vehicle Wiring Harness #C94FR that you referenced is supposed to be used if your 2019 GMC Terrain came with the factory tow package. If those fuse locations are empty, then it sounds like you don't have the factory tow package. As of…

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Answer 10

There isn't a specific distance you want to have between the bumper of a vehicle and the hitch ball, but in general you'll want more than an inch. This will give you additional leeway when hitching up the trailer so that you don't slam…

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Answer 11

The trick here is to get as close as possible. If you are talking about less than 2 inches or so, there is nothing to worry about. Having the trailer tongue a bit too high is preferable to it being too low. You may be a good candidate for an…

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Troubleshooting 4-Way Wiring Relays Wont Install on 2018 GMC Terrain

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