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Expert Answers about Jeep JL Wrangler Unlimited


  • Mounting Location for Westin HDX Nerf Bars on 2018 Jeep Wrangler JL Unlimited
  • The Westin HDX Nerf Bars with Drop Steps - 4" Wide - Black Powder Coated Stainless Steel # 56-140652 will mount to the pinch weld as well as threaded hole behind pinch weld. I've attached a photo of the instructions to assist.
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  • Which Side of Vehicle Does Hopkins Trailer Wiring Install Harness 42615 Install 2018 JL Wrangler
  • The Hopkins trailer wiring harness part # 42615 that fits your 2018 Jeep Wrangler JL Unlimited installs by connecting on the passenger side of the vehicle. It installs inline with the taillight harness that's on the passenger side of the vehicle.
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  • Does The ThermaHeat RV Holding Tank Heater Pad Require Special Wiring
  • You'd most likely be fine just using some # 16-1-1 with the standard casing but you could also get some wire with exterior rated jacketing if you wanted to go the extra step. You can also get some wire loom # 7509-10 and run it the length of the wires and use electrical tape to secure it. When installing the ThermaHeat RV Holding Tank or Step Heater Pad w/ Thermostat # 277-000164 you'll also want to use a switch like # 37212595 to be able to turn it off when not needed to avoid an unwanted...
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  • Can Autowbrake Electric Brake Controller # 3430001 be Powered by a Trailer Mounted Battery
  • You could use the trailer mounted battery to power the Autowbrake Electric Brake Controller # 3430001. However, it is possible that the unit will deplete the battery and you won't have any trailer brakes. The battery could receive a maintenance charge from the 12 volt circuit on a 7-Way trailer connector but if you do that you should instead just use that 12 volt circuit to power the Autowbrake.
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  • Wiring Options for a Brake Controller on a 2018 Jeep JL Wrangler Unlimited Without Tow Package
  • Since your 2018 Jeep JL Wrangler Unlimited doesn't have the factory tow package you will need to start off with 4-Way wiring like the recommended Tekonsha T-One # 118786. Once you have that installed there are a few options for you. You can either install the 7-Way RV Upgrade Kit # ETBC7L which only adds 12V power to the 7-Way and allows you to use the Curt Echo # C51180 brake controller with an Apple or Android smart device, or you can install the Universal Installation Kit # ETBC7 for...
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  • Does Included 6-Way Connector Bracket Mount Directly to Tabless Base Plate # DM9519339
  • I spoke with my contact at Demco and the 6-Way connector bracket that is included with the Demco Tabless Base Plate Kit # DM9519339 referenced in your question isn't really designed to mount to the base plates themselves. The bracket is a universal piece that will simply get mounted to a flat surface in a convenient location on your Jeep. Because vehicles greatly differ depending on various packages and models, there aren't any specific instructions as to how and where the bracket should...
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  • Does the Remote Need to be Left Plugged in While Towing with the Tekonsha Prodigy RF
  • According to the owner's manual for the Tekonsha Prodigy RF Wireless Trailer Brake Controller part # TK94FR, "The Prodigy RF may operate with reduced performance if the Remote Hand Held Unit is removed or disconnected while the trailer is in use". Therefore, no the remote cannot be removed from the power source while towing with your 2018 Jeep JL Wrangler Unlimited.
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  • Will LED Tail Lights on 2018 Jeep JL Wrangler Unlimited Affect Install of Roadmaster Diode Kit
  • The Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267 will work perfectly on your 2018 Jeep JL Wrangler Unlimited and the vehicle's LED tail lights won't affect the install or function of the kit in any way. You will just follow the attached install instructions like normal. I have attached the mentioned installation video as well.
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  • 2018 Jeep Wrangler Unlimited Sahara JL Wiring for Flat Towing
  • For your 2018 Jeep Wrangler Unlimited Sahara JL flat tow wiring, you will need the Roadmaster Stop Light Switch Kit # RM-751490 which will communicate with your motorhome's brake monitoring system that your Jeep brakes are being applied. This is to help you know if a problem is occurring like your Jeep brakes constantly being applied so you can solve an issue before damage occurs. I reached out to my tech contact at Roadmaster and you will not need the relay # RM-88400 because the factory...
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  • How To Attach Brown Wire On Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit
  • In regards to the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit part # RM-15267 which is a fit for a 2018 Jeep JL Wrangler Unlimited, you only need to splice the brown running light wire from the harness into one of the running light circuits on the vehicle. It does not matter if this is on the passenger side or driver side. There will then need to be a jumper wire run from the diode to the other side but an additional splice into the vehicle's running light circuit is not needed.
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  • Does Hot Lead on Wiring Harness for 2018 Jeep JL Wrangler Unlimited Have to be Run to Battery
  • Thanks for the purchase and that is a good question, but you must run the hot lead directly to the battery when installing a 4-way, which in your case is the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56407. The reason is this is the only way to ensure your car's wiring is not otherwise affected, and you can run the hot lead from your battery in any manner you see fit. To do this you may need Wire Loom, 10' Long # 7509-10 and Loom Clamp -1/4" # A0250....
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  • Wheel Chock Recommendation for Use with Off Road Jeep Trailer Parked on Incline
  • For larger tires like you have, the Buyers Products # 337WC1086UWH would be best for chocking your tires. This being made of rubber means that it will have great traction on your driveway and won't slip.
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  • Installation of Power Wire of Jensen JWM60A to Replace Jensen AWM970
  • Your Jensen stereo part AWM970 that you have currently has a more traditional power wire setup where one wire carries 12 volts to power the stereo and the other carries a 12 volt signal wire that only is hot when the key of the vehicle is on to tell the stereo to power on. The # JWM60A only has one power wire and that needs to be ran to the hot all the time power source since this is a motorhome application where you'll be using it without the vehicle on. You'll just have to power it off...
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  • Can Diodes for InvisiBrake be Installed on Wiring for Trailer Plug of Towed Vehicle
  • Although it would be easier to install the diodes like part # RM-792 on the trailer connector, for the InvisiBrake # RM-8700 to work properly the diodes need to be installed at the rear of the bulbs. The reason for this is that the 4-Way trailer connector recieves the signal "after" the lights so they wouldn't be effective.
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  • Trailer Hitch Wiring, Hitch and Brake Controller for 2018 Jeep Wrangler JL Unlimited
  • The wiring you need to add a brake controller and tow a trailer with electric brakes with your 2018 Jeep Wrangler JL Unlimited starts with a 4-way, the T-One Vehicle Wiring Harness # 118786, and I've added a link to an install video of this harness on an '18 Wrangler for you. You will then need the Universal Installation Kit for Trailer Brake Controller # ETBC7, which will give you a 7-way connector, circuit breakers and the rest of the hardware needed to install a brake controller. I...
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  • Installation of Trailer Hitch on 2018 Jeep Wrangler JL with Additional Bracket at Frame
  • The Draw-Tite Trailer Hitch Receiver - Custom Fit - Class II - 1-1/4" #36424 has been discontinued but was a fit for the standard bumper on a 2018 Jeep Wrangler JL. It will not slip over the bracket you reference so it is not a fit for your specific vehicle due to that bracket. Instead I recommend the Curt Trailer Hitch Receiver - Custom Fit - Class III - 2" # C13392 which doesn't have the weldnuts attached to the hitch. This will allow you to attach the hitch underneath the bracket...
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  • Will Installing Trailer Wiring Harness Void Warranty on 2019 Jeep Wrangler
  • That is a great question. The good news is that consumers are protected by the Federal Magnuson-Moss Warranty Act. This act essentially states that if something were to break or go wrong on your Jeep and you take it in for warranty repair, the dealer must honor the warranty regardless of what modifications have been made unless the modification is what caused the issue. Installing an aftermarket wiring harness like the excellent Tekonsha T-One # 118786 yourself that you referenced will...
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  • Can 3rd Brake Light on 2018 Jeep Wrangler be Used When Flat Towing
  • The 3rd brake light on your 2018 Jeep JL Wrangler runs on a separate circuit so while it's possible to have it activated while flat towing the vehicle it's not something that any of the harnesses we have available are designed to work with, including the Roadmaster Diode Kit # RM-15267 that you referenced. If you really want to activate the 3rd brake light you will need to add a converter like # 118158 that will tap into the combined turn/brake circuits on the Roadmaster harness. On the...
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  • Additional Parts Needed to Install Roadmaster Invisibrake in 2018 Jeep Wrangler JL Unlimited
  • With the Roadmaster InvisiBrake kit part # RM-8700 that you referenced the only thing else you need to install it in your 2018 Jeep Wrangler Unlimited JL is the stoplight switch part # RM-751000 and you'd be set. I attached a link to a video that shows this kit installed on a 2018 JL just like yours for you to check out as well.
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  • Can Extension Piece on Thule Roof Cargo Basket # TH859XT-8591XT Be Removed
  • Yes, the extension on theThule Roof Cargo Basket # TH859XT-8591XT can be removed so that you can use the basket in its original length of 49 inches. With the extension added the basket measures 69 inches long. If you think you will use the extension piece at some point on the vehicle then this is definitely the way to go, since it gives you the option of going with either the longer or shorter cargo basket. I have attached a short video demonstration that you can also check out.
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