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Trailer Wiring Harness Installation - 2005 Dodge Durango

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How to Install a Wiring Harness for a Trailer on a 2005 Dodge Durango

Today on this 2005 Dodge Durango we will be installing wiring harness part number 118390. Okay we are at the rear of the vehicle, we are going to go ahead and locate the ports that we are going to be plugging our wiring harness into. These ports are located directly behind the tail lights, both on the drivers and passenger side. Okay the first thing we need to do is remove these tail lights to gain access to these ports. :19

To remove the tail lights we simply need to remove the two interior push pins here on the tail lights. There are also two push pins here on the inside of the tail light, so once you have the two removed from the inside you just want to simply rock it back and forth until those release. You can also see our port here that we are going to be plugging our wiring harness into. We need to separate it from the back of the tail light. To do so, we just want to take the red clip here and slide it over, then push the release here at the top. That will allow us to separate the two. :55

We can go ahead and start installing our harness. Over here on the drivers side we are going to be installing the plug that has the brown, yellow, and red wires on it. We are simply going to plug one side into the vehicle into the harness and the other side into the back of the tail light. The other two wires that we have here are the plug ins for the passenger side tail light. And then obviously, this is our 4-pole that is going to connect to the trailer. You can take both of these and route them through the same opening. We are obviously going to take the connector for the passenger side and route it all the way across to make our connection. The 4-pole we are going to take to the middle of the vehicle and tie it off at our trailer hitch. You can also see here we have a red wire that is open ended, this will connect to the black wire that came with our installation kit, the long black lead. We are going to take that and it down the opening between the vehicle and bumper and route it up the drivers side frame rail where we are going to connect to a power source under the hood. When connecting the red and black wires together we just want to strip back a little bit of the jacketing here off of each wire. Take the butt connector which is provided with our wiring kit, slide our wire into there and take a set of crimpers and crimp that down. Then we will the other end into the butt connector and crimp that down as well. Might want to take some electrical tape and wrap that up. 2:18

Then we will go ahead and feed the wire in between the opening. Then next we are going to take our modulite box here, as you can see on the back side it has double sided tape, we want to take it and adhere it to the back of the tail light housing. With those items completed we can go ahead and put our drivers side tail light back on. We can go ahead and remove the passenger side tail light as well and we will go underneath the vehicle and route our wires across. Underneath the vehicle you can see the three sets of wires that we ped down between the bumper and the body. Again, the black wire is going to be going up the drivers side frame rail to the battery, so we can hold off on that wire for the time being. The four pole we are just going to route to the center, I am going to tie it off on my trailer hitch. You can see we have some fascia support straps here throughout the back side to route the wiring behind to keep them out of the way and weather safe. And we will repeat the procedure that used on the drivers side for connecting the harness into the tail light. Now we will go back underneath the vehicle and route the black wire up to the battery. When routing your wire up to the battery you want to make sure you avoid any possible pinch points or hot spots that could damage the wire. And what I have already done is route a piece of fish wire from under the hood of the vehicle down here towards the frame so I can tie my wire to it and pull it into place. 4:19

We are up underneath the hood now and you can see we have our wire routed from underneath the vehicle. At this point we need to find a power source to hook our hot lead to. We can either route it across the rear threshold here over to the positive side of the battery, or in this instance we can go ahead and use the power leads that are feeding our fuse box here to tap into, right here. So what you I want to do is remove one of the nuts off the two studs here. We are going to next take our fuse holder and cut it in half. So again, we just want to strip off some of the jacketing off of both ends. The one end we are going to put a butt connector on and connect it to the black wire that we routed up from the back of the vehicle. The other end we are going to connect a ring terminal to the post here. What I am going to do is connect to the power source first, that will help us determine how much of the black wire we actually need. You can see I have quiet a bit of extra wire, so we can cut it down to the appropriate length that we need. With those connections made there we can go ahead and take some electrical tape and tape that connection up as well. You want to make sure you the 10 amp fuse here in the fuse holder. And with all of our loose wires secured and out of harms way our installation is complete. This will conclude the installation of wiring harness part number 118390 on a 2005 Dodge Durango.

David C.


Video was fantastic, informative and easy to follow. I would have liked to see the connectors hooked up to the trailer connected to make sure the two connectors are fitted together. I am thinking of getting a 5X8 plate bed trailer need to be sure the connector are compatibility with each other.

Victoria B.


The T-One Harness has a 4-Way Flat trailer connector. This type of connector is often used on smaller trailers that do not have brakes and only use the wiring for taillight, stop, and turn functions. I have linked a help article that has a lot of wiring information in it, but will also give you an idea of the different types of trailer connectors so that you can know what different connectors look like as you look at trailers.

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