Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Quickly and easily connect your towed car's lighting system to your RV to activate the signal lights required for towing. This custom harness plugs directly into your Jeep Grand Cherokee's existing wiring - no cutting or splicing required.
Typically, wiring your car for flat towing is a tremendous chore. You have to position and mount multiple diodes beneath your car and then splice into the car's wiring. Before cutting and splicing, though, you have to use a circuit tester to identify each wire. This must be done for the wires carrying signals from your running lights, brake lights, and both turn signal lights. And don't forget to jump the diodes so that the running light signal is sent to both sides of your car.
Or..you could just plug in the TrailerMate wiring harness. This custom-fit system plugs into your Jeep Grand Cherokee's existing wiring harness, which is located behind your car's tail light assemblies. No cutting, tapping or splicing is required. The wiring around the plugs is encased in durable convoluted tubing, making it easier to handle and safer to route as well.
After plugging in the wiring harness, use the included bracket to mount the 4-way flat connector at the front of your towed car. Then hook up to your RV with the supplied wiring extension, and you're good to tow. Note: The extension included with this system requires that your RV have a 4-wire flat trailer connector. If your RV has a 7-pole round connector, or another type of connector, then an adapter is required.
Because your Jeep Grand Cherokee has a combined lighting system - wherein the brake signals and the turn signals are carried on a single wire - a brake light relay (RM-88400 - sold separately) may be required if you use a supplemental braking system with your towing setup. A supplemental braking system depresses the brake pedal in your towed car every time you apply the brakes in your RV. So, if your towed car's brake lights illuminate when the brake pedal is pressed and the engine is off - as is the case when towing - then you need to install a relay to ensure that the lights on your towed car always act in accordance with the signals sent by your RV via the wiring harness. Without a relay, the brake signal from your towed car will override the turn signal sent by your RV when you slow down to make turns, creating a potential hazard.
When you're not flat towing your car, the TrailerMate wiring harness can remain on your Jeep Grand Cherokee; it will not interfere with the electronics. And if you ever tow a trailer with your car, you'll be wired and ready. The TrailerMate system comes ready to accept 4-flat wiring (TM85330 - sold separately) at the rear of your Jeep Grand Cherokee so that you can hook up a trailer quickly and easily. Just plug in the add-on 4-way trailer connector, and you're good to go.
Video of TrailerMate Custom Tail Light Wiring Kit for Towed Vehicles
Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Today we're reviewing part number TM781117 from TrailerMate. This is a custom taillight wiring kit for towed vehicles. This part number is made specifically for the Jeep Grand Cherokee beginning in model year 2007. Using the etrailer.com Fit Guide will help you determine whether you're particular vehicle will work with this kit.This part provides an easy way to give power to the brake light and turn signal in your towed vehicle. You don't have to do any cutting or splicing it's a simple plug in installation. Let's start with the driver's side.
At the rear of the vehicle you should remove the cover over the back of the taillight and locate the wiring harness behind the taillight. Disconnect that and plug in these two connectors into your driver's side wiring harness.You'll notice that the driver's side wire has a yellow wire right here. Then you do the same thing on the passenger side. The passenger side has a green wire where the yellow wire was on the other side. Do the same thing, disconnect the wiring harness and plug these two connectors in to the wiring harness.Now you'll notice there's a third connecting wire at the rear.
What this is for is it enables you to install a four-way at the back of your Jeep Grand Cherokee for when you want to tow using that car as the tow vehicle. In order to make this operable you will need to purchase part number TM85330, that's sold separately. It's the TrailerMate custom taillight wiring kit with a four-pole flat trailer connector.The third thing you want to install after you plugged in your drivers side and passenger side wiring harness is your ground wire and this should be mounted on a clean, unpainted metal surface using one of the self-tapping screws that's provided in the kit. You've installed three things and then the next thing you want to do is run the long power wire, right here up to the front of your vehicle.You can secure it to the frame under your car using the included cable ties. Once you get the power wire up to the front of the vehicle you'll see that you have a four-pole here and you need to mount that.
A mounting bracket is included. You see two holes and you have two self-tapping screws for that. You see the slot in the front, all you do is slide the four-pole into the slot and then it's mounted at the front of our vehicle.Then you have also a four foot extension loop. This is included in the kit. Some kits don't include extension loops but this one from TrailerMate does so that's convenient.
You want to connect the four-pole that you just mounted to the four-pole on the extension loop like that and then the extension loop hooks up to the four-pole at the back of your RV. Now if you happen to have a seven-pole behind your RV rather than a four-pole you will need to get a seven-way to four-way adapter and we do sell those at etrailer.com.Then you're all hooked and you're ready to go. Please note that this kit will prevent damage to your Grand Cherokee's electrical components that might be caused by electrical feedback from the RV because it has built in dyads that safeguard the wiring. Also it will not interfere with the electrical system on your Cherokee when it's not hooked up to an RV. If by some chance you use a supplemental braking system you might need to get a brake light relay.In that case look at part number RM88400 sold separately. There you have it for the TrailerMate Custom Taillight Wiring Kit for your towed Jeep Grand Cherokee.
Average Customer Rating: 4.6 out of 5 stars (84 Customer Reviews)Quickly and easily connect your towed car's lighting system to your RV to activate the signal lights required for towing. This custom harness plugs directly into your vehicle's existing wiring - no cutting or splicing required.
Ordered a tow hitch and base plate plus the wiring harness, people were great to deal with a and my order was shipped right away. Tow hitch and wiring was easy to install, the whole experience made me a return customer. Thanks Etrailer 63705
by: Jim C03/31/2014
Etrailer has the best customer service of any company I have dealt with in several years. I received a call from etrailer that the wiring harness was back ordered and the company that made the harness could not give a shipping date. I was offered to change to another harness (Hoskins) but I decided to go with the TrailerMate since I had prior experience with that brand. I was kept informed all through the ordering process and received the wiring harness in about two weeks. The TrailerMate harness is very easy to install and worked perfectly. The instructions are clear and made the installation easy. There are two way to run the wiring from the rear of the vehicle to the front. Since I was installing on a 2014 Jeep Wrangler that will be going off road. I wanted as much protection as possible on the wiring. I opted to run the wiring through the frame rails. The instructions say to use a fish tape and pull the wire. Since I didn’t have a fish tape and didn’t want to buy one for a one time use. I used an old 12 ft metal carpenters tape. There is an opening near the rear where the wire comes from the harness and another near the front driver’s side wheel. Run the tape through the front opening to the rear (you will probably have to giggle it around to get it over the rear part of the frame). At the rear opening pull the tape and fasten the harness wire to the ruler tape and then pull the tape to the front of the frame where to can route the wire to the front connection point. 123105
by: gary s05/05/2013
directions were easy to follow and installation was a breeze. sure beats cutting and splicing wires. 79059
by: Jim C04/01/2013
Harness is very good quality. The connectors are factory type and make the connections secure. Routing the wire to the front of the vehicle without a lift is a little difficult but doable. The passenger side taillight connection wire was not long enough and I had to re-route the wire through the metal “frame tube” behind the bumper cover not along the existing factory wiring as stated in the directions. I did have to make my own bracket for attaching the connection at the front of the vehicle since I am dolly pulling and not using a front tow bracket. Everything else when as shown in the directions and the video. I would recommend this product and would purchase it again. 73770
by: Ed O.07/15/2013
Fit the Jeep good and works well. The lead from the RV to the Jeep was too short for my tow bar but not a big problem. 89627
by: Terry N.12/19/2013
In general I am very pleased with the product and installation information. Some of the installation information could be more defined. such as were to run the wiring after it come out of the frame rail. The wires that run between the rear tail lights could be about 12 inches longer. I do have a question as well; when I ordered the kit I asked if the harness provided blocking diodes within the harness and was told it did. I have not connected it to my RV yet and wanted confirmation about that? If it doesn't I just wasted 75 Dollars on my purchase because I will then have to modify the circuitry to prevent an electrical problem from occurring! 110596
by: Philip Johnson02/07/2013
Just Received the TM783120 TrailerMate kit for my 2013 Honda CRV today and it looks real easy to install from the instructions that come with it and the quality looks awesome and etrailer was awesome to deal with super fast shipping and good communications, and I'm sure this is going to work just fine when I get ready to use it thanks etrailer. 65372
by: Sheb M10/08/2012
Really takes the hassle out of how to rig for towing lights. No wires to cut or splice, just plug in to existing harness and presto--You are ready to go 56652
by: Larry L08/06/2013
Great product, no wiring or splicing to do, just plug it in and it worked the first try, It was a little tough routing it through the frame and then feeding it around the engine compartment where it would be safe, cutting the hole near the right tail light required some special tools that some folks might not have? I'm a retired Flight Test Mechanic so this was a piece of cake for me. Sense it's all hidden behind the tail lights and in the frame, photos of the finished job won't show much 93575
by: Paul O.01/31/2014
Excellent wiring harness for my vehicle. Didn't have to cut or splice any wiring and the extra plug for connecting the tail lights to my small trailer when I use that is really a plus. The only negative was most of the zip ties for anchoring the harness were brittle and broke when tightening them. Not serious, but aggravating when I was lying on the ground, under the vehicle, stringing the harness in place. You have excellent support and prompt responses. Thank you. 115321
by: Dean S.02/17/2014
The product arrived on time. Easy straight forward installation. Hardest part is routing the wiring to front of vehicle. Takes a little bit of time to do a clean job. The supplied harness to go from your tow vehicle to towed vehicle is useless. It is way, way too short for any kind of towbar. The product has nice connectors and is of good quality. Honestly is it somewhat over priced but I found nothing of equal quality for a less price. 116704
by: Bill S.08/29/2012
Product was easy to install with good instructions My only problem was the short umbilical cord (48") that accompanies the kit. It is too short for a "toad" install. You will probably have it disconnect and you will loose it on the road and have no toad lights. Otherwise, a good product. Strongly suggest you get a longer umbilical cord. 53466
by: Sean C.04/14/2014
After researching the internet for a wiring harness and getting a bit confused I placed a call into e-trailer and was able to speak with a rep who guided me to exactly what I was looking for. He assisted in placing my order and a couple days later I received exactly what I needed. The wiring harness and plug matched up perfectly and I will use them again in the future for all my trailering needs! 124962
by: George W.08/23/2012
This product is the easiest vehicle tow lighting harness I have ever worked with. A couple of years ago I installed a lighting "kit" on my honda pilot. Man what a hassle, I had to install individual diodes for each line using crimp connectors yuck. This complete kit was finished in a couple of hours. If I did this install again It would take about 45 minutes tops. 52745
by: Mike H.05/21/2013
Very easy and straightforward install. The only caveat is if the Ford Edge is equipped with the Sony Premium soundsystem. The placement of the subwoofer prevents routing the custom taillight connections up to the back of the taillight. An easy fix is to cut the wires near the bottom before the wires route up. Fish them down and reconnect. Piece of cake. 81317
by: wayne p05/15/2013
not sure why anyone would cut and splice in diodes ever again, this wireing set installed in less than 30 min, 4 screws to pop the taillights out, plug new wires and run wires to front of the jeep. i did replace the 4 flat with a 6 round on the towed end to keep the battery up, but a prefect fit with factory look and no butt connectors to corrode. 80341
by: Gary G04/30/2013
I ordered the Trailermate TM781104 wiring kit to wire up my Jeep to tow behind my RV. It was easy to install and the overall quality was good, except the plastic wire ties provided were brittle and they all broke when I tried to use them. Also the 4 wire pig tail from the Jeep to the RV was much to short, by about 5 feet. 78495
by: Johnny D.05/02/2013
I have not yet installed this product but I'm very mechanically inclined and this product looks like it will serve my purpose. The kit seems to include everything necessary for my application. I purchased the intended install vehicle a week ago to use as a dinghy for my RV. Thanks for the speedy shipping of this kit! 78739
Made too short ,jumper too short paid too much for product that doesn't fit right 134942
by: Jim B03/11/2014
Ordering was easy. Shipping was fast. Customer service was on top of everything. This is the way everything should be when doing business on line. I have already installed the base plate and this is my next project. One more after that. The tow bar. See you again soon. 120290
by: John F10/25/2012
This certainly appears to be a great & simple way to wire the tail lights for towing behind a motor home. It needs to be noted in the listing, that it will not fit 2012 Malibu LTZ. 58146
Great product! Installed the day after I received it and it is one of the easiest installation I have ever accomplished. Instructions and photos were very accurate which is why the installation went smoothly and quickly. Thanks for a great product. 86925
by: Dennis O05/27/2014
The wiring kit was easy to install with clearly written instructions. This wiring kit is just what I need for towing my jeep behind my motor home. No need to attach clumsy, awkward towing lights that can mar the jeep's paint or fall off. 132719
by: baxter m05/16/2013
Over all an excellent product, but the instruction sheet needs a little work. Also,I left the tail lights on and put the wiring inside. now I need to get through firewall, but I needed more light than available at the time. 80484
by: raimund v.12/05/2012
recieved my custom tailight wiring kit, came on time, was exactly as illustrated ,it works great , could not be any happier. great company to deal with. will use e-trailer again w/ocation arises thanks e-trailer 60786
by: John N02/04/2014
All went well, just followed the instructions for installation and it was pretty much a snap. Product was put together such that everything fit without any need for adjustments. Very good product 115762
by: Hugh A.07/21/2014
Great idea, would have been a fast and easy installation if the harness was not wired backwards. Had to reverse the wires at both harnesses, wiring issues caused us an additional hour to install. 142391
Shipping was fast, packaging was good, easily installed but the wiring harness from the rear to the front of the vehicle was 12" too short, had to ad an 18" jumper. Not to happy about that. 61826
by: TOM M10/30/2013
The product was exactly as shown and very easy to install. Also, the employees at etrailer were the most pleasant and efficient that I have ever dealt with. Thank you, etrailer staff. 105732
by: jimmy b.05/16/2014
product arrived on time and in good condition , easy install , but as reviews already described wiring to connect to vehicle not near long enough other than that good product. 130938
by: Bob A.09/07/2012
Good quality connectors, very easy to install. Only problem was the main section of wire is too long and the extension piece is way too short. Other than that it worked great. 54116
by: Ron Maitland10/12/2012
Got the shipment 2 days after placing the order. I have the jeep in the shop right now getting it wired. Everything seemed in order. I am pleased with my ordering experience. 57038
by: Mike E.03/11/2014
everything arrived as advertised, and very quickly. I haven't installed the product yet, but plan to as soon as all the snow melts. It appears to be a nicely built product. 120311
by: Mike B.06/24/2013
Outstanding product. Fast delivery. Great instructions and it works perfectly. And this company really puts customer service first. Very nice to have found them. Mike 85820
A very great product, was just as advertised. Took one and a half hours to install and Iam very pleased with both the product and the service of e-trailer.com 100499
This was the coolest thing, very simple install and worked. Item is assembled well, looks good and worked perfectly. I will never splice a cable again. 70100
by: Rilo Johnson09/22/2012
A quality product. I installed the kit on a 2009 Honda CRV. Everything went as described, Good instructions and easy to install. Works like a champ. 55513
by: Jeff B.04/08/2013
The kit was very easy to install, and works great, the connecter wire from the jeep to the motorhome was to short needs to be about 2ft. longer. 74721
Quality was good and installation fairly straightforward. Only issue was the wire from the Jeep to the tow vehicle was about a foot too short. 67901
This is a great product it was easy to install and it worked perfectly. It would be worth it at twice the price. Thank you Larry Thomas 64293
it was quite easy to install, in the future sales people should ask if you wanted the tow package with it . I had to just order it! 109145
by: Warren H01/08/2014
I examined the wiring harness and find the quality to be excellent. It appears that it will be easy to install on my Jeep Liberty. 112229
by: Alan G.03/18/2014
just what I needed. instructions were very clear and the installation couldn't have been easier. a great buy at a great price. 121101
by: Jon F.08/05/2013
So easy to install you don't have to be a pro to do it ! Just plug into car wiring and run the wired up front and that is it ! 93443
EXCELLENT FIT AND EASY INSTALLATION, GREAT PRODUCT. PS. TY STRAPS WERE PLASTIC AND BRITTLE, YOU SHOULD USE NYLON STRAPS. 91720
All the Products we ordered were as described and the E-mail updates were great thanks for the timely service. 122628
by: George D05/29/2014
Well made and a perfect fit for my JK 4 door. Install was a breeze, and it worked as expected and advertised. 133251
Saves alot of time...didn't have to drill holes in tail light assy..just plug in to existing factory wireing ! 58495
Installation was easy and straight forward. Instructions were good and product seems to be of high quality. 66692
Product as described. Easy installation. Easiest way to wire your Jeep for towing behind your R.V. 67427
Ask the Experts about this TrailerMate Tow Bar Wiring
Info for this part was:
At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.