Recommended Wiring Harness For 2018 GMC Terrain Without Towing Package

Updated 02/19/2020 | Published 02/18/2020

Products Featured in This Question

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

(73)

$23.30

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

(217)

$55.93

Question:

Got the hitch and harness installed no problem. I was told I needed to install relays to make it work. I havent tried it without the relays, not sure i should, if it could damage anything. They are located at K1 and K3 in the rear fuse box is what i have found out from researching. I dont believe those are even there. I have no K1 or K3! Any help would be appreciated. I have a 2018 Terrian SLE, no tow package with the 1.5L Thank you.

asked by: Jon

Expert Reply:

If you do not have a towing package you will not have the locations for the relays in the fuse box that come with the Curt T-connector wiring harness part # C56375 or the Curt wiring harness part # C94FR because they are designed for the 2018 GMC Terrain with factory tow package.

expert reply by: Heather A