Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.
This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located inside your trunk or cargo space, behind the tail lights on both the driver's side and passenger's side. You will need to remove some interior trim or carpeting to access this harness. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.
Once installation is complete, the 4-way flat connector will be stowed within your trunk or rear cargo area.
It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.
A ModuLite power module is built into this T-One connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of your trailer. This power module functions as a tail light converter to combine the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.
With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.
Video of T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Today on this 2010 Mazda CX-7 were going to install part number 118405 from Tow Ready. The first thing we need to do is open up the back hatch and remove the interior panels. Well remove the floor coverings, well remove the threshold, and well remove the access panels on each side of the vehicle behind the taillights. With all the panels loosened up we can go ahead start installing our wire harness. Well start on the drivers side and work our way over to the passengers side. Now there will be two connections we need to make on the drivers side, therell be the yellow wire for return signal and there will be the red wire for the brake signal and also the running lights.
So basically all were going to do is take apart the connections that goes into the taillight and match them up with our wire harness and plug them in between. And then well go ahead and route our green wire over to the passengers side and repeat the same process. Also go ahead and find a suitable location to ground our white wire. Then well go ahead and find a location to mount our module and well clean off the area with a sheet metal and attach it. Now Im going to move on to the red wire that ran out of the module.
Well attach our longer black wire that comes with the kit and well run that outside to the body through this grommet thats located on the drivers side just ahead of the spare tire. And well make a cut into the grommet and well route the black wire through there. With the black wire ran through the grommet well go ahead and reinstall the interior components. Then well go ahead and continue running our black wire up to the battery. Now when we run the wire up to the battery well make sure we stay away from anything thats hot like the exhaust or anything moving like the suspension components or up front the steering components.
Once we have our wire ran up to the front well route it over through the engine bay up to the battery. Well cut our black wire to length and then well add a fuse holder. Well cut the fuse holder in half, well attach our black wire to the fuse holder with the butt connector and on the other side well get the ring terminal. And then install a ring terminal onto the positive side of the battery. And then we can go ahead and install the fuse.
While our connections are made on the hood we can go ahead and show how to use a 4-pole wiring harness. When we need to use it we just pull it out and then shut the hatch on it, just make sure we stay away from the latch in the center. And then well go ahead and pull out what we need to pull down to our trailer. And with that that will finish it for our install of part number 118405 from Tow Ready on our 2010 Mazda CX-7.
Average Customer Rating: 4.6 out of 5 stars (25 Customer Reviews)
by: Randy T12/10/2013
I was impressed with the speed of delivery and ease of installation. The power wire is the hardest work, the rest takes about 10 minutes to install. Directions were easy to follow and splicing of the wiring harness required.109815
by: Jerome J.09/08/2013
Excellent product came with easy to understand instructions. I completed installation in a little over 2 hours and saved myself $175 doing it myself. I've used Etrailer 4 times now and delivery time and customer support have been excellent every time.98939
by: Jerry Hudrlik06/29/2013
The instructions, in trying to be all things to multiple vehicles, leaves me trying to sort out the instrustions for just my camry and having a hard time doing that. The product is identified as for the 2007 camry and I have a 2012 vehicle. I trust that it will work..86716
by: Jorge P.04/29/2013
This product is excellent! Although I haven't used it to pull the boat yet, the harness came complete, ready to install, and the directions were simple to understand. This was a "plug and play" installation!78278
by: John Lomax04/25/2013
I just received my order yesterday. I haven't had time to even open it yet. I 'll let you know when I start trying to install my trailer hitch. I don't know if there are instructions inthe box??? I hope so since I've never installed a trailer hitch on a car (Mazda CX7) before. I may be calling you if I have any trouble. Thanks for your follow up. JB Lomax77850
The wiring harness was delivered to my front door within two business days. I installed the harness in my FJ and it works perfectly. You will need two tools to complete the job, they cost me $40. bucks but the net cost was still well below a dealer install. You will need long needle nose pliers, I bought 8 inchers. Also, you will need a tool to pop out the retaining fasteners on the trim; if you try to use a screwdriver you will most certainly break the fasteners. You will also need a wire stripper tool to complete the job. I am not the sharpest knife in the drawer so the job took about 2 hours to install and reassemble the trim. I would recommend this product to anyone who can read and follow directions. Thanks much to etrailer for a great value and fine product.59796
by: Steve D.02/12/2012
At this point, I have only just installed the hitch and wiring. The hitch was installed very easily and the on-line video at e-trailer.com was very helpful (actually, the video was a primary reason for purchasing from this company). Hitch looks very good. The trailer wiring was relatively easy to install. As others have commented, the trickiest/most time consuming part was getting the black (power) wire to the front of the car and the battery. Overall, very happy with my purchase. The price was as good as I could get anywhere, the on-line video, and (free) delivery as promised are very positive for me. Would purchase from e-trailer again and will recommend to others.31606
by: L. Jones01/03/2012
I was pleasantly surprised by the rapid processing and delivery of my order. The product was of top quality. I was informed that my delivery method was upgraded without cost to me and resulted in a faster delivery. I will reccomend your company for any future orders.29027
by: Dennis M.05/02/2011
Easy wire hookup. Running the wire to the battery under the vehicle took the most time. You'll need extra wire ties to make sure the wire doesn't sag. Instruction said to run the wire through a grommet in the storage compartment. This will not work if you have dual exhaust. Ran the wire through a grommet just behind the back seat. 12672
Idiot proof connectors. A pain to run the wire to the front, but easy enough. I used the rubber grommet on the left side of the cargo area, just behind the rear seat, and stayed on the left side right up the front wheel well into the motor compartment. Take your time. Glad I didn't pay for a tow package. Everything you need in the kit. 9.9 out of 10 9659
by: Jason H02/17/2011
Product does what it's supposed to do. Huge pain to run a power wire from the trunk area to the battery up front, but that's not this product's fault. That's what happens when you install a towing set-up on a vehicle that really wasn't designed for it. Only thing this product didn't have enough of was zip-ties. They give you 5 or so, but when you run a power wire under your car, I felt the need to secure it better in certain places, so I used an additional 10 or so of my own. Not a huge deal though as I think zip ties are as crucial to have on hand as duct tape.7304
I loved the fact that the harness plugged right into the factory wireing. Instructions and pictures were great. Took a little over an hour to install. Will definitely buy from etrailer again. 18986
by: Julio and Pepelui05/16/2012
Real easy to install, at the beginning I thought it was hard to install, but after watching the video provided it was a piece of cake. Julio and Pepelui of Buena Park, CA40634
Worst instruction sheet ever! Item may be good. Have not had enough time to gauge life span but it does do what it is supposed to but the instruction sheet is the worst. Once you decipher the instructions it installs easily. 1711
by: Patrick Brewer08/26/2013
They upgraded delivery to 3 - 5 day ground and it was here the next day. Great products as described. Very helpful people. Great Customer service.97022
by: Ron D.08/19/2013
Had my mechanic do the wiring harness. Car lift not required but did make it easier.95714
The wiring harnss was easy to install following the excellent instructions. It works.88237
by: harry m07/08/2013
The instructions were just good enough to get the job done, but better pictures or a video would have beneficial for the fj cruiser. 88086
Wiring harness was as described. Very easy to install. Workers great. Received item very fast. Would buy again from etrailer.55532
by: Ron Kosko08/02/2012
I have not installed the trailer hitch yet, but the instruction are very good, the product arrived in less time than expected and was in grest shape. I won't hesitate in ordering from etreailer again.50298
by: Clint N.07/22/2012
Follow the directions and the install was a success. Everything worked on first test.48909
by: Gary J.03/13/2012
Fantastic. Keep up the good work. I'll be back.33732
by: Bruce W.03/13/2012
easy install, I took my time about an hour and 15 minutes. Hardest part is getting into the small area's of a Toyota to plug in the harness. 33725
by: Rick M01/30/2012
Excellent shipping, packaging and servi ce.30526
by: Eric W03/31/2011
Very fast delivery!.. Nice packing and looks to be a pretty install.10802
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