dgreen1069
Active Member
I just installed the Mopar flat tow harness yesterday. Words cannot describe how useless the instructions for this kit are. The pictures help a little but aren't a great representation of anything. I was expecting this project to take about 3 hours but I ended up working in the dark for half the install and it took 6 hours. Nothing was terribly difficult, just lots to do with little to no guidance from the instructions.
Here are a few tips:
Watch a video on installing the hitch wiring for tips on how to remove most of the interior trim pieces. The trailer hitch wiring and flat tow wiring are installed in very much the same manner.
Watch a video on removing the entire fender with inner fender attached vs following the directions and messing with all the rivets and such. This is an absolute time saver.
Watch a video on removing the rear bumper. All the videos I saw were for 2018's and the middle attachment points have changed for the 2020's. There are four bolts on each side of the bumper where it attaches to the frame plus two 10mm bolts on the bottom of the bumper on either side of the hitch.
Don't bother running the harness from one tail light to the other until you have removed the bumper. With it out of the way, it's more clear where the wiring is routed. If you already have trailer hitch wiring, some of the holes used to attach the flat tow harness are used up. It wasn't a big deal, but seeing how the trailer hitch wiring attached was helpful for getting the driver's side correct.
Use a coat hanger to fish the wiring through the firewall grommet. I tried doing this from the interior first but had better luck starting from the engine side and going inwards. I thought a flimsier hanger would be helpful but it was not. The grommet is two layers and the flimsy hanger I tried using wasn't punching through very easily. A stronger hanger made quick work of it. This part is a giant pain in the ass! Don't take the hanger off when you get through the firewall. It was helpful in bringing the wiring up towards the battery also.
Like many jobs, the first time was a giant PITA. I'm fairly certain I could knock the project out again in less than 3 hours.
Here are a few tips:
Watch a video on installing the hitch wiring for tips on how to remove most of the interior trim pieces. The trailer hitch wiring and flat tow wiring are installed in very much the same manner.
Watch a video on removing the entire fender with inner fender attached vs following the directions and messing with all the rivets and such. This is an absolute time saver.
Watch a video on removing the rear bumper. All the videos I saw were for 2018's and the middle attachment points have changed for the 2020's. There are four bolts on each side of the bumper where it attaches to the frame plus two 10mm bolts on the bottom of the bumper on either side of the hitch.
Don't bother running the harness from one tail light to the other until you have removed the bumper. With it out of the way, it's more clear where the wiring is routed. If you already have trailer hitch wiring, some of the holes used to attach the flat tow harness are used up. It wasn't a big deal, but seeing how the trailer hitch wiring attached was helpful for getting the driver's side correct.
Use a coat hanger to fish the wiring through the firewall grommet. I tried doing this from the interior first but had better luck starting from the engine side and going inwards. I thought a flimsier hanger would be helpful but it was not. The grommet is two layers and the flimsy hanger I tried using wasn't punching through very easily. A stronger hanger made quick work of it. This part is a giant pain in the ass! Don't take the hanger off when you get through the firewall. It was helpful in bringing the wiring up towards the battery also.
Like many jobs, the first time was a giant PITA. I'm fairly certain I could knock the project out again in less than 3 hours.
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