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 Jeep Grand Cherokee 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 Jeep Grand Cherokee's wiring harness, which is located behind the driver's-side and passenger's-side interior trim panels in your rear cargo area. 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 in an out-of-the-way location within your 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 Jeep Grand Cherokee'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 Jeep Grand Cherokee operate.
With a ModuLite, your trailer's lights will be powered without overloading your Jeep Grand Cherokee'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 we are going to be installing wiring harness part number 118349 on a 1998 Jeep Grand Cherokee. OK, we are inside the rear of the vehicle now, and we are going to go ahead and locate the ports for the wiring harness. The ports can actually be located on the interior side, directly behind the tail light assemblies. Here on the drivers side is actually a door that we can remove and be able to locate the ports inside of there. On the passengers side, we actually are going to have to remove the interior panel and gain access that way. So, the first thing I am going to do is go ahead and remove the spare tire off the holder, so I can get a little more room to do some work here.
OK, with the spare tire removed, we can go ahead and remove the door, and the point that we are looking for is located right here. This is going to be the drivers side plug-in. So what we can do is go ahead and depress the push button here. And with the two ends disconnected, we can go ahead and plug our harness in line. The drivers side plug-in is the plug with the yellow wire in it. As you can see, there is a ground terminal here as well, so we want to find a suitable grounding point inside this chamber to secure the ground to. I am going to go ahead and secure the ground to this metal right here at the back side of the chamber. I am going to use the self-tapping screw that was provided in the installation kit. And again, I am going to go ahead and remove the double-sided tape from the back of the module light, and adhere that to the inside of the compartment here. I am going to go ahead and pull back the paneling here and remove this sphere threshold piece, pull back my paneling on the passengers side and make my connection there. And there are a few more screws here that we need to remove as well. And with the panel pulled back, you can see the connector here on the passengers side. We just want to disconnect that and plug our harness in line. All right, and with our connection made, we just want to go ahead and put everything back together. And I am actually going to pull up the carpeting just a little bit and route it underneath there. That will keep it nice and secure for us. If you have any excess wire, you can go ahead and zip-tie that to the existing wiring harness here, using the zip-ties that are provided in the installation kit.
This time we are going to go ahead and make our connection to our positive power lead with the bundle of wire that is provided in the installation kit. I am just going to strip back a little bit of the jacketing of the wire, it into the butt connector, and crimp that down. To route the wire to the battery, I am going to access the grommet that leads to the back side of the tail light assembly on the outside of the vehicle. I am going to pull that out and feed our wire through there, and that will allow us to get it below the vehicle and up toward the battery. OK, and with the tail light assembly pulled back, we just need to remove the rubber grommet. With the grommet pulled out, I am just going to go ahead and put a little slit into it. That will allow us to feed our wire through there. OK, and then back inside the vehicle we can just go ahead and feed our wire through the opening behind the tail light assembly - just enough to where you leave the connection point inside the compartment here. It might be a good idea to put some electrical tape around that connection as well. And again, you can secure all the loose wires together with some of the zip-ties that are provided in the installation kit there. At that point, we are pretty much done with the inside of the vehicle. We can go back out to the tail light assembly now and show you how to route the wire up to the battery.
With the wire pulled through, there is an opening between the bumper and the body of the vehicle. We can go ahead and just feed our wire down through there, and then we can re our grommet. And again, we just want to feed the wire through the little slit that we put in the rubber grommet, like so, and pull the extra lead all the way down. And then we can put our tail light back on. Now we are going to go underneath the vehicle and route our wire to the front. And you definitely want to make sure you secure any loose points of the wire to the vehicle with the cable ties that are provided. It is always a good idea to try to route along existing wiring that is on the vehicle. And then once you get to the end of the framework, you want to go ahead and feed the wire up through the engine compartment. We are up inside the engine compartment now with our lead pulled all the way up. We need to get over here to the passengers side, where the battery is located, to make our connection. So what I am going to do is, I am going to go ahead and use some of the cable ties and cable-tie the wire against the back firewall, and cable-tie it to the lines that are running back there, and route it directly to the battery. And now that we have got the wire fully routed over here to the battery, you want to go ahead and cut off any excess wire that you may have. What we are going to do is take the fuse holder that was provided in the installation kit, and we are going to go ahead and and cut that in half add the ring terminal that was also provided in the installation kit to one end of the fuse holder. And then go ahead and remove the nut from the positive side of the battery here. We just want to add the ring terminal to the battery and we are going to go ahead and make our connection from the black wire to the fuse holder. We are going to use the butt connector, again, that is provided in the installation kit, tape up our connection, and go ahead and the 10-amp fuse that is provided in the installation kit. And then secure any extra, loose wires that you may have, and your installation will be complete. And this will conclude the installation of wiring harness part number 118349 on a 1998 Jeep Grand Cherokee.
Average Customer Rating: 4.8 out of 5 stars (45 Customer Reviews)
by: Robbin S.06/25/2013
Fast service, correct product sent, and very helpful and knowledgeable staff. Thanks for your great service. I got my product in the time you said and I found it was easy to install and everything fit as described.. I am attaching some pics of the installation process.Thanks again.86151
To start off my harness was delivered 4 days after ordering.I dont know what there thinking over there @ e-trailer but it's suppose to take 7 days! lol. I am glad that it did come in so fast. The instillation was very simple (i did watch there video,very helpful.) took about 15 min. to hook the harness up ,the time consuming task is running your hot wire to the battery. And that just depends on how picky u are with your work. Then of all things it worked!! lol. It realy does work like it's supose too! e-trailer I give u an A+ Thank u for making my task easy.5904
by: Leon A10/28/2012
I ordered this converter for my 97 Jeep Grand Cherokee. After a 2-3 minute read of the instructions I proceeded to access the tailight plugs on my vehicle. You will need to remove the spare tire and open up both left and right side panels in the rear of the vehicle to gain access to the rear lights harness. After that it was simply unplug the existing connectors, plug in the adapter, route your wires under the tailgait cover panel, connect a power wire to a battery source and reassemble. Easy to do. Took me about 20 minutes and I was done. The Etrailer adapter kit was litterally plug and play. Works great. I am satisfied with my purchase and would recommend to anyone.58212
by: Bob P.06/27/2012
Called etrailer.com at noon on Thursday in a bind and needing a wiring harness for my 1997 Jeep Grand Cherokee. With the assistance of the sales woman I placed an order and requested over night shipping. I received a package by noon the next day!!! Hooked up the wiring harness and it worked great!! Just in time for my weekend camping trip with my pop-up camper.45758
Very Good design and relatively easy to install. Works as described, was very impressed that my vehicle wiring harness was spared after the rental trailer I hooked up to deteroiating wiring shorted out. Since I prefer to run wiring along established safe routes within the vehicle (instead of as suggested in the installation instructions and video) an extra 2ft of primary lead wire and and extra foot in the right side signal harness would have been beneficial andf appreciated.106172
by: Dave Byers06/28/2013
The trailer wiring harness arrived within a few days of ordering and installed in minutes and is working fine.. Everything I needed to make the harness connection was included and I am very happy with the whole ordering process.. thank you86632
by: clifton m.04/09/2012
the product was packaged very well and all parts were there. other than having a little difficulty getting panel off jeep all the conections and routing whent extremely well and was completed in a little over an hour.and everything worked perfect.36716
My review is mainly for etrailer and not just the product. First order I placed with them and it was on a sunday morning, got and email that day letting me know the item was in stock, notified on monday afternoon that it shipped, and received it on wednesday. Etrailer will get more of my business and I would recommend them to others.26315
by: Ronald Godwin10/13/2011
It works very well but I think the instructions need to be a lot more detailed for most people. It took some time to figure out a few things and the fuse that must be installed does not explain what to do very well at all, (Thats the yellow thing up there in the picture). Other then needing much better instructions it is a great product and I WOULD buy it again without any problems. 25517
by: Mark T.07/08/2011
I am installing this harness this weekend so I cannot give a product review yet, but would like to praise Etrailer's service. Email confirmations were immediate and shipping was prompt! I recieved the harness within 3 days after placing my order! The price (with shipping) was much better than my local RV or auto parts store. This is my second purchase from Etrailer and I'm a satified customer!18948
by: Keith R12/11/2010
Easier than I expected. Follow the video instructions and you can't go wrong. Route wire under truck along driver's side and you'll avoid most of the hot, exhaust system. Product works great! Installed on 96 Grand Cherokee Laredo with the tow package.3981
by: David W05/28/2009
Well made, easy to install Liked the instruction video. It was easier to understand than the written instructions. Everything from ordering to installation was easy and well thought out. It wasn't the lowest price but the website gave me confidence that this was the one for my car and everything was included for an easy install.1904
Good. but tough to install Our 1998 Grand cherokee DID NOT HAVE the little access panel that is shown in the instructions and photos. That meant taking out several interior panels which was a huge problem since the fasteners usually break. The lengths of wire worked OK, but what a hassle getting access to the vehicle wiring! Our 1997 had the little access door the '98 didn't. 1816
Poor Instructions Product fits great. Instructions have you run the positive lead wire down passenger side, under vehicle, which is the side the exhaust system is on. Very difficult to keep away from heat no places to zip tie it to. I routed wire accross back of engine, zip tied it to existing wire harness, then pulled it through existing hole in fender. Under the vehicle on the driver side, you can zip tie it to the brake lines out of harms way.1274
by: brian r.05/15/2008
Good but Worked well but the positive wire going to the battery needs to be several feet longer for the 98 Jeep Cherokee Kit. I had to run it on the inside of the vehicle to have enough wire and still barely had enough. Had to remove several interior trim panels in the process.866
this wiring harness works great ,very easy install.very good price,i did check around. thank you67278
by: Buddy J07/23/2012
Items ordered arrived fast and i received everything I needed. Instructions were included and online video answered all other questions. Great folks to deal with here!49098
by: Jason C06/22/2012
Wiring harness installed in 30 minutes, super easy being that my 12v power wire was already in place from the old harness. Great service and extremely fast shipping.45182
by: chris little06/15/2012
but i think you need to provide better illustratio maybe some pics on here of the installment of said product .ty chris44220
The harness kit was very complete, and installed as shown on the video. Excellent product.42963
by: Mark T10/25/2013
Excellent Product , Great Directions , Prompt Shipping , I will definetly purchase more items whem needed from etrailer.com 105190
by: Mike R.06/07/2013
Easy to install. Video on your web site was very helpful. Could have used a few more zip ties.83768
by: Bobby Ray Cameron05/17/2013
Easy install. Works great! 80732
by: Wil M.04/28/2013
Easy product to install thanks to the video how-to. 78182
by: Richard H.05/22/2012
Great, arrived very quickly, just followed the video on the site and was very simple, works great41265
by: jason r05/15/2012
very simple to install 40594
Great product! Fast shipping! Extremely easy to install!! Thanks very much!!38848
by: chris p04/30/2012
easy to install, but fuse line instructions and where to connect it on the black box were not as clear as they could have been. no markings on the black box. 38801
by: Ken E04/18/2012
the harness was easy to hook up.the t connector is the key. no trying to tap into wiring harness, just plug in.. Then run a small wire from the battery to the harness and hook up a ground wire to frame and you are good to go.37651
by: Billie K.03/20/2012
It was very easy to install . I am very happy with the product. I wish they gave about six more zip ties in the kit though! Had the harness installed in an hour or less. I would recommend this product to everyone!34538
by: Ron Hartl03/01/2012
Great Product. Excellent Quaulity. Easy online video instructions. Below average Price. Great Customer Service. it doesn't get much better than that.32919
by: Phaedra W.02/11/2012
easy to order / recieved in 2 days /easy to hook up / pluged it in / on down the road we went pulling our trailer.. No problems as of this date ..31488
by: aaron koch10/25/2011
Awesome product..videos are a huge help ..26064
The kit contained every thing needed for installation. Clear on line instructional video made it simple. The in-line plugs made connection into my Jeep's wiring harness easy and clean.24594
by: Eric L.06/29/2011
Fit well and worked well. Instuctions made install a breeze.18169
by: Pete B.06/21/2011
This wiring system was so easy to install. eTrailer.com provided a great online video tutorial of the installation. That helped a lot because the instructions from the manufacture was limited. 17517
by: Clint Powell06/20/2011
trailer harness is working fine. you should put a flyer in your packaging or email a link to your youtube videos of installations.17418
by: Steve S06/12/2011
It worked just fine, and the video was a real help16781
by: Dana H06/06/2011
awsum trailer hook up!!!! simple to install and SUPER service!!!!16197
by: Matt S05/03/2011
It came fast, and installed fast! I just added a little shrink tube over the splices under the hood but it probably wasn't necessary. 12834
so easy a caveman could do it 12279
by: Gerald J. Latiolais01/07/2011
Product shipment Without a doubt, this is the best service I have ever had from a distributor. Thanks !! I'll pass the word.5177
excellent service great service loved shopping will do again a +++++4163
by: Matthew C.12/07/2010
Very Simple. Could not be any easier.3788
It was very easy to install Everything that came in the package was exactly what I needed. It helped to watch the installation video on youtube. Thanks 1759
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