Hey all, I have a 2018 terrain that doesnt have the tow package. It is an SLE 1.5L. I put a hitch on and installed the harness no problem. I havnt tried it yet to see if it works but I was told that it needs the relays installed. Which are in the back located at K1 and K3 I believe. but I don't have those slots! It looks like there not even there. Any input would be much appreciated. I am picking up my new 4 wheeler on Wednesday and i have to borrow a truck to get it because i couldnt figure this out. Thank you!
I installed a factory hitch on my 2018, 1.5 Equinox Premier, installed the factory harness and hooked up my small aluminum trailer. All lights worked fine with no need to address any relays. I did replace the end of the flat four harness connector with a 7 pin connector to match the trailer which in turn matches my truck. The hitch is actually designed for the 7 pin connector which is available from Curt, Polack and and others. It's a twist lock recepticle like the one used on the 2.0 equippad vehicles.
As stated above, if you get the gm oem hitch, it comes with a harness that plugs into the connector hidden above the bumper. That harness has left and right turn relays in the wiring. Parking lights already have a relay in rear fuse box. So you are good for those connections.
But if you get aftermarket hitch that hangs under the bumper, I don't know, but my experience is writing not included. But as for adding relays in the fuse box...mine has a couple spots that are empty, but those empty slots have no contacts/wires in those positions...not an option to add relays easily up there.