bing tracking image

Tow Ready Tail Light Isolating Diode System Installation - 2019 Jeep Cherokee

content loading

Customers compare TR118821 to these similar products




Products Featured in this Video



How to Install the Tow Ready Tail Light Isolating Diode System on a 2019 Jeep Cherokee


Speaker 1: Today, on this 2019 Jeep Cherokee, we'll be having a look at and showing you how to install the Tow Ready Tail Light Isolating Diode System with a Four-Pole Connector, part number TR118821.Now, in conjunction with our diode wiring harness, we also use a Roadmaster 7 to 6 Coil Kit. That'll give us the six-way connector that we have on the front of our vehicle, and give us a seven to six-way coil cord. We'll have the six-way end going into the front of the Cherokee, and the seven-way on our motor home.This is great because not only can you run your turn signals, your brake lights and your tail lights, but you can also run a charge line kit to charge your vehicle's battery. If you have a braking system with an indicator light on it, inside the motor home, you can run the indicator light wire through the six-way connector, through one of the unused terminals, and run that as well. You can have all those functions at the same time.Now, our six-way connector is great because we have this nice spring-loaded door on it which not only will protect it from the elements when it's not in use, but it'll also help hold our wiring plug in place when we are flat towing our Cherokee. We can easily remove the coiled end just by using the two finger hooks here and pulling out.

Gives you a nice place to grab hold of, so you don't have to worry about pulling by the cable and pulling the cable out of the connector.This is what the diodes look like in place. As you can see, we have full control of our vehicle's factory LED tail lights. We're able to utilize those, basically treating our Cherokee like a trailer. We'll have our brake lights, our turn signals and our tail lights. Now, because the Cherokee does have LED tail lights, you can't use a bulb and socket inside the housing.

Your only options when you're flat towing this behind your motor home is either doing diodes, like we did, or magnetic tow lights.Now, most people don't like magnetic tow lights because they have the risk of slipping off the vehicle and scratching your paint. It's also one less thing you have to worry about bringing with you and having a place to store it once you're not hooked up to your motor home. Here's what our diode packs look like behind our tail lights. We're looking at our passenger side one. The driver's side one looks identical.The way these work is that they get the signal from the vehicle, then it'll go into the diode pack.

Then, it'll come out and go into the tail light. This way, your factory lights still work as normal when you're driving down the road without having the vehicle hooked up to your motor home. When you're hooked up to the motor home, you'll get the signal from the wire for your tail light, your turn signal and your brake light. That'll go to the diode pack and send signal out towards your tail light.The way diodes work is they allow electricity only to flow in one direction. It'll only power the light bulb.

You don't have to worry about any computers or modules getting damaged from unexpected electricity flowing through them.To begin our install, we're going to open our rear hatch. We're going to remove our tail light assembly by first removing these two T30 Torx 00:03:43 screws. With those removed, we can grab our tail light assembly and wiggle it off the vehicle. We'll disconnect it by pushing down on this gray tab here and pulling back. Then, we'll just pull it off the assembly. Repeat the same process for the passenger side.Now, we'll take our passenger side diode pack, that's the one that says passenger side, and we'll drop it down on our driver's side behind the tail light pocket. We have everything dropped down now except for our driver's side diode pack. We need to clean off an area so we can apply it to the side of the vehicle with the double-sided tape. Use some soapy water, peel off the backing and we'll stick it down where it's not going to interfere with our tail light assembly going back into place. We'll just press it firmly against the side of the vehicle so it'll stick.Now, we'll remove some of our electrical tape that's on from the factory to get access to our wires, so we can splice into them. We have determined that our green wire is for our tail lights. Our red wire is for our brake lights. We'll be utilizing the same wires on both sides of the vehicle. We'll take our green wire and we'll cut it right in the middle. We'll do the same for our red. We'll strip back insulation from all four ends now.Okay, the side of our wire gets furthest away from our tail light connector. This is going to go to the input side of our diode pack. That's the one that's labeled input on the side. The other side's labeled output. We're going to grab our brown wire. We notice that it has a male spade terminal on it. We're going to have to grab a female spade terminal to crimp onto our wire. That's our tail and that goes to the brown wire off of our input side. We'll just plug that in, these are already crimped on from the factory, just like that.The other end will get the output side. This one has a female spade terminal. In this case, we'll use a male terminal so they can match. We'll just plug the two together. Now, we can do the input side for our brake light. That leaves us with the output side for our left brake light. Here's what it looks like with all of our connections made on the driver's side.Now, we'll take a pull wire and we'll drop it down in our passenger side. Looking up at our bumper cover on the driver's side, you can see our wires here, the yellow and the brown wire. We want ahead and routed our wires and our diode pack behind this cover here on our bumper cover. Here's where our four-pole flat is resting. We attached our pull wire to the end of our diode pack. This is the pull wire that we dropped down. Now, we're going to pull this up behind our tail light pocket on the passenger side.I went ahead and cleaned our area where we're going to stick our module on the passenger side. We peel off the backing and we'll stick it in place, just like we did on the driver's side. I went ahead and zip tied up the excess wires that we have to the factory wiring harness here. This way, we don't have to worry about having the slack be visible underneath the vehicle behind our bumper cover.Now, let's take our green wire, want to cut that in the middle. We'll strip back some insulation both ends, and we'll do the same for our red wire. Now, we're going to start with our tail lights, so that gets the brown wire. We have the input side right now, that has a male terminal. We'll grab one of our female terminals to match it. We'll take the green wire and we'll match that up to the male on the input side and plug it together.Now, the output wire has female, so we'll need one of our male connectors and connect the two. For our right turn signal, right brake light, on the green wire has a male connector, so got to get a female connector. That'll go to the vehicle inaudible 00:09:18 of our red wire. With all of our connections made behind our tail lights, we can now plug our tail lights back in and reinstall them.Now, we'll take our female four-flat extension, put some dielectric grease inside of it, which we have available on our website, this will just help better protect it from the elements. We'll plug that into the male four-flat end that's on our diode wiring harness. We'll use the zip tie that comes with the kit to make sure our connectors will stay locked together. This dust cover here, we're not going to need this anymore. We'll just cut it off.Now, this white wire with the ring terminal that comes off of our harness, this is our ground wire. We need to attach this to the vehicle's sheet metal to provide a ground circuit. We'll just attach it using this self-tapping screw. We're going to do ours on the passenger side right behind our exhaust hanger. We secured up our wiring to this wiring harness here to keep it away from our exhaust. Then, we routed our four-pole extension to the front of the vehicle, making sure we avoided any sources of heat or moving parts.We went above our rear subframe through your differential, then it goes to the side of our gas tank, goes behind the skid plate for it, comes up and we go underneath this skid plate and follow this all the way to the front where it comes out. We go to the very bottom of our subframe, underneath the sway bar and the rack-and-pinion. Then, it comes up right to the side of our oil pan here, keeping it away from the belt. We go underneath the AC compressor and we have the zip tied wiring harness that goes to that.We then tucked it underneath our radiator and our AC condenser and brought it over right here, underneath the prongs which attach our electrical connector. Now, since our motor home doesn't have a four-flat in the back of it and we're also going to be installing a charge line kit, we're going to remove the four-flat connector and put a six-pole connector on the front. We're going to use a seven to six coil cord to adapt down from seven-way in the motor home to the six-way in the front of our vehicle.What we're going to do, we're going to cut off all of our excess and our four-pole connector, since we won't need it, just to give us our four wires in the front. We'll go ahead and separate these. We'll go ahead and strip off the insulation from our four wires. Now, we'll start with our tail lights and marker lights. This terminal marked TM, we'll loosen that set screw and that'll get our brown wire. Insert the wire and fully tighten the set screw.Now, we'll do our ground wire. That's terminal marked GD. Now, we'll do our left turn signal and left brake light. That's terminal marked LT. Now, we'll do our right turn signal and right brake light. That's terminal marked RT. Now, since we're adding a charge line kit to our vehicle as well, we're going to go ahead and hook it up to our six-way connector at the same time as we're doing our lighting wiring.Now, you can pick up this charge line kit on our website if you need one as part number RM-156-25. This will help ensure that your vehicle's battery remains charged whilst being towed behind your motor home. We're going to hook this up to our auxiliary terminal, and that is the center terminal here marked A, and tighten the screw down. Now, we'll take the other end of our red wire and we'll feed it through our dust cover.Now, we'll take some dielectric grease, which we have available on our website, and flood the backside of our connector. This will help prevent any corrosion from occurring if water was to get inside. Now, we'll slide the dust cover down and we'll take some electrical tape. We're going to tape the dust cover to the connector and down our wires to help better conceal them, and also help prevent any water from getting inside.With all of our connections made, we can now hook up our six-way connector to the front of the vehicle using the provided screws that came with the baseplate. Now that we have everything back together, it's a good idea to test out our wiring, make sure it's going to work properly. We have our seven to six cable hooked up to the front of our Jeep. We're using a tester. If you don't have a tester, you can hook up to your motor home and test it that way.We'll start off by turning on our tail lights, make sure those work. Here, tail lights are working on both sides. Now, we'll do our left turn signal. As you can see, that's working. We'll do our brake lights now, both of those are working. Now, we'll do our right turn signal. As you can see, that's working as well. We now know everything's working properly.That'll complete our look at and showing you how to install the Tow Ready Tail Light Isolating Diode System with Four-Pole Connector, part number TR118821, on this 2019 Jeep Cherokee.


Questions and Comments about this Video

Stephen B.

Your worst video. missing many pieces. You should review it

Etrailer Expert
Reply from Chris R.

I'm sorry to hear that the video wasn't helpful. Can you tell me what in particular is missing or where you think it needs improvement?

Info for this part was:

Employee Joshua S
Video by:
Joshua S
Employee Kathleen M
Video by:
Kathleen M
Employee Jonathan Y
Video by:
Jonathan Y
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Brent H
Test Fit:
Brent H
Employee Shane H
Test Fit:
Shane H
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F
Employee Clayton O
Test Fit:
Clayton O

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. Let us know if anything is missing or if you have any questions.