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Trailer Wiring Harness Installation - 2016 Acura MDX

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How to Install a Trailer Wiring Harness on a 2016 Acura MDX

Today on our 2016 Acura MDX we're going to be taking a look at and installing the T-1 Vehicle Wiring Harness with a 4 Pole Flat Trailer Connector. Part number 118628. Here's what it's going to look like once it's installed. This is going to provide you with a 4 flat trailer wiring to allow you to tow most of your smaller trailers. It is compatible if you wanted to add an adapter to change it from a 4 flat to a 6 or 7 way connector. The power module light is going to reduce stress on your vehicle's wiring system.

It's simply a plug and play operation. You don't have to cut any wires or splice, which is a good thing with today's electronics that are in our vehicles. This is what your kit's going to consist of. We're going to have our module, our inline fuse that's going to plug right into our factory fuse box in the back of the vehicle, and our 4 flat connector with a weather-tight cap. It also comes with a couple of fuses that we're going to put into our factory wiring, some 2 sided tape and some zip ties. Now let's show you how to install it. To begin our install we're going to need to gain access to the fuse panel.

Take this cover, we'll slip it back. We'll reach in and pull out this cargo pocket. We're going to need to gain access to our fuse panel that's located behind this cover here. We'll take a flat bladed screw driver and pry it out at the bottom. We'll find the area that we're going to plug in our trailer wiring that's going to go right here in the bottom of our fuse panel.

We're going to take our wire with our plug on it, we're going to fish it through the back side here. We're going to bring it out and we're going to snap it in to our panel. We heard it click, give it a tug make sure it's nice and tight. We still have access to the built in fuse holder for our module light. Now we're going to need to ground our system. We're going to use a factory ground that's located here in the back side.

We're going to tie into the factory ground. That's a 10 millimeter bolt, we'll remove that and we can apply our ground wire. Place our bolt through the ring loop connector and we'll reinstall our factory grounds. Now we'll take a little rubbing alcohol, we're going to clean off the area that we're going to mount our control box. Put some 2 sided tape on the back. Peel it off and we're going to attach our box right there. Press it into place. Now we're going to need to put a couple of fuses in our fuse panel. Our kit's going to come with a 10 amp and a 7.5 amp fuse. The 10 amp is going to go in position 2. We'll place this into position 2. We're going to push it all the way in until it's flush with our panel. Our 7.5 amp fuse is going to go into position number 11. That's going to be our fourth cavity over. We had 1 large one and then 3 small ones. This will be in our fourth one. It's the one that it'll get our 7.5 amp, going to push that down firmly into place. We want to double check to make sure that our fuse is installed properly into our inline fuse, which is a 15 amp. We can reinstall our fuse cover. Snap it back into place. Now we can test our wiring harness. We'll remove our weather-tight cap. We're going to use the Curt Trailer Wire 4 Flat Tester, part number I26 available on our website to test our system. We'll plug it in. We're going to try our tail lights, our left turn signal, and our right turn signal, and our brake. Good, everything works. Normally you would just lay your trailer wiring over the threshold and close the gate on it for a 4 flat design. Our customer is going to add on a 7 way later on, so we need to run this wire outside the vehicle so we can plug into our 7 way connector when they're ready to do that install. We found there's a grommet underneath this perforated area, there's a rubber plug that goes outside the vehicle. We're just going to cut that rubber plug. We'll remove that plug with a flat bladed screwdriver. I'm going to take it and go underneath this rubber mat so we can put it back down and cover everything back up. We're going to place this under the mat and we're going to cut a little notch in our cover here, put our wire through, and we can silicone it back up. We can remove that piece we cut out. Take our plug and we'll pass it back through the vehicle to the outside. We'll slide our wire into the grommet that we put the groove in, we'll snap it back into position and we can zip tie our wiring to our factory wiring, snip off our excess. We're going to take a little black RTV available on our website, and we'll place a little bit of silicone on here to help seal out all the dirt and moisture. We can place our storage bin back into position, this will fit over the back side and it'll just drop down. Everything's hidden underneath. We just close up our hatch. Now we can bunch up our excess wire and we're going to zip tie it to the tube on the back of our hitch. We'll attach our 4 flat for now until we decide to do our trailer braking, or 7 way connector, to the bottom side of our bracket. Trim off our excess and we'll be ready to hit the road. That's going to do it for our look at and install of the T-1 Vehicle Wiring Harness with 4 Pole Flat Trailer Connector, part number 118628 on our 2016 Acura MDX.

Steve B.


Video was very helpful. I thought the instructions that came with the harness werent very good, but this video made them unnecessary. I made 2 modifications to my install compared to this video: 1 - No need to cut a hole in the rubber mat to run the wires under the vehicle. If you are going to run the wires under the mat anyway, why cut the hole you arent going to use. 2 - Rather than using 2-sided tape for the controller box thingy, I just used the sheet metal screw that also came with the product in the same bag as the tape and zip ties.Very easy install.

Etrailer Expert

Rachael H.


Info for this part was:

Employee Joshua S
Video by:
Joshua S
Employee Jonathan Y
Video by:
Jonathan Y
Employee Jacob T
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Jacob T
Employee Dustin K
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Dustin K
Employee Chris R
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Employee Zach D
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Zach D
Employee Cole B
Installed by:
Cole B
Employee Andrew S
Test Fit:
Andrew S
Employee Robert C
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Robert C
Employee David F
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David F
Employee Ryan G
Test Fit:
Ryan G

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