Tow Ready Tail Light Isolating Diode System with 4-Pole Connector

Tow Ready Tail Light Isolating Diode System with 4-Pole Connector

Item # TR118821

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Tow Bar Wiring

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TR118821 - Tail Light Mount Tow Ready Tow Bar Wiring
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Product Images

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  • Diode Kit
  • Splices into Vehicle Wiring
  • Tow Ready
  • Tail Light Mount
  • Universal
This combined diode system features a Y-harness that allows your RV to power the lights on your towed vehicle without the vehicle sending electrical feedback to the RV. The 2-diode system does the work of 4 and protects both electrical systems. Lowest Prices for the best tow bar wiring from Tow Ready. Tow Ready Tail Light Isolating Diode System with 4-Pole Connector part number TR118821 can be ordered online at etrailer.com or call 800-298-8924 for expert service.


  • All Info
  • Reviews (28)
  • Q & A (48)
  • Videos (5)
  • Photos
  • Why etrailer?

Tow Ready Tow Bar Wiring - TR118821

This combined diode system features a Y-harness that allows your RV to power the lights on your towed vehicle without the vehicle sending electrical feedback to the RV. The 2-diode system does the work of 4 and protects both electrical systems.


Features:

  • Kit includes everything required to wire vehicles with a 2-wire system for towing behind a motor home
    • Y-Harness with 1 driver's-side and 1 passenger's-side diode
      • Each diode contains a tail light and combined turn and stop feed
    • 4-Pole flat connector extension
      • Runs along your tow bar
      • Connects RV wiring system to the Y-harness
    • 8 Wire connectors, 1 ring terminal and 4 zip-ties
  • System connects your RV turn signals, running lights and brake lights to your towed vehicle's lights
  • 1-Year limited warranty


Tow Ready Tail Light Isolating Diode 2 wire to 2 wire diagram

Tow Ready Tail Light Isolating Diode 2 wire to 3 wire diagram

Please note for 3-wire system on towed vehicle: With this kit, the towed vehicle's brake lights will function as both the brake and turn lights. A wiring converter (118158; sold separately) and 2 additional diodes (also sold separately) will be needed if you want to retain separate turn and brake signals.



118821 Tow Ready Tail Light Isolating Diode System with 4-Pole Connector



TR118821 Installation InstructionsInstallation Details TR118821 Installation instructions

This Product Fits The Following Vehicles

1995 - 1997 Nissan 200SX

2012 - 2019 Fiat 500

1993 - 1994 Oldsmobile 88

1986 - 1997 Ford Aerostar

2002 - 2013 Chevrolet Avalanche

2007 - 2011 Chevrolet Aveo5

1985 - 1994 Subaru Brat Pickup

2004 - 2019 GMC Canyon

1982 - 2005 Chevrolet Cavalier

2017 - 2018 Toyota Corolla iM

1982 - 1996 Oldsmobile Cutlass Ciera

1987 - 2011 Dodge Dakota

2010 - 2011 Ram Dakota

1998 - 2018 Subaru Forester

1998 - 2019 Nissan Frontier

1994 - 2002 Infiniti G20

2015 - 2015 Volkswagen Golf SportWagen

1984 - 1993 Jeep Grand Wagoneer

1994 - 2001 Hummer H1

2006 - 2010 Hummer H3

2008 - 2008 Lexus IS 250

2018 - 2018 Jeep JL Wrangler Unlimited

1987 - 1995 Acura Legend

2002 - 2012 Jeep Liberty

1990 - 1996 Chevrolet Lumina APV Van

2002 - 2003 Mercedes-Benz M-Class

2009 - 2011 Mercury Mariner

1984 - 2006 Nissan Maxima

2010 - 2019 Lincoln MKT

2011 - 2019 Lincoln MKZ

See All Vehicle Fits

California residents: click here


Video of Tow Ready Tail Light Isolating Diode System with 4-Pole Connector


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Tow Ready Tow Bar Wiring - Splices into Vehicle Wiring - TR118821 Review

Speaker 1: Today, we are taking a look at the tow-ready taillight isolating diode system, with the four-pole connector. This combined diode system features a wire harness that allows your RV to power the lights on your towed vehicle without the vehicle sending electrical feedback to the RV. The two diode system does the work of four and protects both electrical systems. Customers offer compare this system to magnetic tow lights and they're very happy when choosing this system over other options because with this system you install it and basically forget about it. You don't have to worry about it. You don't have to worry about magnetic lights falling off the vehicle or have to deal with all the wiring of magnetic tow lights hanging all over your car.This kit comes with everything needed to wire vehicles with a two-wire system for towing behind a motor home.

The wire harness features a driver side and passenger side diode box, so the diodes are built in, they're protected, so, again, you really don't have to worry about them at all. Each diode contains a taillight and combined turn and stop feed. The diode boxes have adhesive backing, so you can easily peel and stick it to a nice clean surface, and I think that makes installation a lot easier. If you wanna add more security to it you could wrap a zip tie around it, maybe secure it to a wiring harness or a wiring bundle to keep it protected, but it does come with adhesive backing.As long as you stick it to a nice clean surface you won't have to worry about it. When it comes to making the connections it's pretty simple.

It simply wires into your vehicles electrical system. Again, it comes with everything needed to do so. The detailed installation instructions walk you through the whole process step-by-step. They are very thorough. Step-by-step goes over each wire, each connector, and it has detailed imaging, which makes installation much easier.Also, it includes a four-pole flat connector extension.

This allows the system to easily connect to the RV wiring. It has eight wire connectors, one ring terminal, and some zip ties that are included with the kit. The wire connectors are quick disconnect terminals, so you have male and female ends. The ring terminal is for creating a ground connection. Your ground wire's the white wire, so you would place the wire onto the ring terminal and secure that to an already existing ground post or screw or you can add your own.

Please note, this system can be used on vehicles that feature a three-wire system, but with this kit the towed vehicle's brake lights will function as both the brake and turn lights, so a wiring converter and two additional diodes will be needed if you wanna retain separate turn and brake signals.Again, that only applies to vehicles that wanna use this on a three-wire system. The wiring converter and the additional diodes are all sold separately and available at etrailer.com and it does come with the four-pole flat dust cover. If you have an exposed connector head, you can add that to it and that'll keep the terminals protected from moisture, dust, dirt, and really help prevent corrosion. That's gonna do it for today's look at the tow-ready isolating diode system with the four-pole connector.


Customer Reviews

Tow Ready Tail Light Isolating Diode System with 4-Pole Connector - TR118821

Average Customer Rating:  4.8 out of 5 stars   (28 Customer Reviews)

This combined diode system features a Y-harness that allows your RV to power the lights on your towed vehicle without the vehicle sending electrical feedback to the RV. The 2-diode system does the work of 4 and protects both electrical systems.

- TR118821
by:

I purchased this kit for my 2008 Smart car dingy. The system was easy to install as per instructions and has been working great. I would recommend this kit to a friend. 607102



- TR118821
by:

Good product but the instructions are worthless. If you are not familiar with twelve volt DC power, have someone else do it. 612773


Comments

If you use the provided link, you can see a video of the product being installed. The process will vary from vehicle to vehicle, but the video will give you a good overview of the procedure.

-- Mike L - 03/19/2019

50749

- TR118821
by:

Very easy installation. Customer service was very helpful in making sure I ordered the correct product for what I wanted to do. 332441


Comments

All of the products have been very useful and performed perfectly.

John M - 01/14/2018

32971

- TR118821
by:
2016 Chevrolet Silverado 1500

Very good product, easy to install 493421



- TR118821
by:

Product was great and the installation instructions was very easy , it took me about an hour to hook up everything. So throw away those magnetic lights with wires hanging all over your car (LOL) . Thanks, John 430410



- TR118821
by:
2003 Chevrolet Suburban

Would have went much quicker and been more convenient if the kit would have supplied male and female ends to mate to the ones that come on the wiring. If you dont have them you will need them or cut the ones off the kit a use a splice. Pretty straightforward installation on 03 suburban. 49803



- TR118821
by:
2019 Jeep Cherokee

Excellent quality. eTrailer's online installation video showing how to install this on my 2019 Cherokee was exactly what I needed. I would have hired this out along with the tow plates but I'm confident I can do it myself with eTrailer's online help. 586010



- TR118821
by:
1997 Jeep TJ

The electrical towing kit is excellent! Very good kit, at an outstanding price! The service was Great! Shipped out within a day, and arrived exactly on the scheduled date! Can’t beat the price, quality, or service! The best place I’ve found!!! Randy 559501



- TR118821
by:

The video for this product is not representative of the product. The harness was very easy to install, just follow the diagram provided. Glad I did this rather than magnetic lights that tend to fall off. 434587



- TR118821
by:

Installed and worked good the first time 655320



- TR118821
by:

This is the most simple wiring kit for DIY people like me. It took me 30 min for connect and run upfront. That's why I bought another one for my friend. Will recommend for everyone to use etrainer Products. Very Professional. Great Job Guys! 654232



- TR118821
by:

The converter worked perfectly as stated. Easy to install. 653415



- TR118821
by:

Would love it to be plug and play but it’s not. It was still easy enough to install. I did have a big bag of tie straps of different sizes that you will need running the wires from front to rear. So far so good! 637055



- TR118821
by:

We love the setup! 628146



- TR118821
by:

Great service. Product was sent out the same day I ordered it. Received it within days. Will definitely use this site more often. 612464



- TR118821
by:

easy to hook up but have not used it yet ...will let ya know in may 610538



- TR118821
by:

this wiring was just what i needed. The directions were great! 600506



- TR118821
by:
2013 Lincoln MKZ

Fast shipping, excellent customer servi ce 550672



- TR118821
by:
2000 Nissan Sentra

Very easy installs. Both items seems to be exactly what I needed and a very cost effective solution provided by David G. Thank you and a pleasure doing business with you and your team members. 548740



- TR118821
by:
2018 Jeep Wrangler

Excellent lighting kit for flat towing another vehicle, worked great and easy install on my 2018 Jeep Wrangler JL 521456



- TR118821
by:
2002 Dodge Dakota

As advertised. Received in a timely man ner. 497281



- TR118821
by:

All installation instructions were clear, all parts were in box and the ease of installation was rewarded with it working first time. 454311



- TR118821
by:

Great products, easy to install. Worked just like it should. 450161



- TR118821
by:

As promised and in time for use! 424973



- TR118821
by:
Jeep Wrangler

All went well installing the base plate on my jeep wrangler. 417381



- TR118821
by:
2017 Chevrolet Malibu

As advertised 404822



- TR118821
by:
2016 Jeep Grand Cherokee

Just received RoadMaster Baseplate Kit (-4), Falcon 2 Tow Bar, Diode Taillight Kit and the Wireless Braking Kit for my 2016 Jeep Grand Cherokee Summit. Arrived after only two days! All packages arrived in good shape! 350019



- TR118821
by:

Very easy install for a novice -- 20373


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Ask the Experts about this Tow Ready Tow Bar Wiring
Do you have a question about this Tow Bar Wiring?


  • Wiring to Flat Tow a 2019 Jeep Wrangler Behind a Motorhome
  • Magnetic tow lights, like part # TL21RK, do their job just fine, are less expensive, and don't require much to setup so they're not a bad option by any means. The only real drawbacks to them is that you need to set them up or take them off each time you change from towing to driving the Jeep. They also have a chance of scratching the Jeep's paint since they're being attached to its surface each time. We often recommend them if you're not going to be towing the vehicle very often or if...
    view full answer...

  • Difference Between Roadmaster EZ4 and EZ5 Base Plate Kits for 2019 Jeep Wrangler Unlimited
  • The main difference between the EZ4, part # RM-521450-4, and EZ5, part # RM-521450-5, base plate kits is how they connect to the tow bar. The EZ4 kit uses Roadmaster's Quick Disconnects that are included with a lot of their tow bars. The EZ5 kit doesn't use the Quick Disconnects but uses pins and clips and clips instead. The tow bar's crossbar is used with the Quick Disconnects of the EZ4 but with the EZ5 the lugs of the tow bar fit directly into the base plate brackets. Take a look...
    view full answer...

  • What is the Correct Wiring Kit to Flat Tow a 2017 Jeep Grand Cherokee
  • The Hopkins Custom Tail Light Wiring Kit for Towed Vehicles # HM56208 that you referenced will fit a 2017 Jeep Cherokee, but is not compatible with your 2017 Jeep Grand Cherokee. A similar wiring kit that is confirmed to fit your Grand Cherokee is the Tow Ready # TR118821. This will operate in much the same way as the Hopkins # HM56208. To complete your flat towing setup you will also need a base plate kit, a tow bar, safety cables, a supplemental braking system, and most likely a...
    view full answer...

  • Separating Out a Combined Brake Light and Turn Signal to Have Separate Turn Signals and Brake Lights
  • We do have converters that do separate out the combined brake light and turn signal but # TR118821 is not one of them. What you can use instead is tail light converter # 118158 or # C56196. They both do the same thing. The white input wire is ground (earth), yellow is combined left turn signal and brake light, and green is combined right turn and brake light. On the output side you will have the yellow wire for left turn signal only, green for right turn signal only, and red for brake...
    view full answer...

  • Can a 2WD Automatic 1997 Ford Ranger be Flat Recreational Towed and What Parts are Needed
  • I was able to find an online version of the owner's manual for your 1997 Ford Ranger and on page 244 it looks like you can flat (recreational) tow your vehicle but you will need to disconnect the driveshaft at the rear differential and properly support it under the vehicle otherwise you can only travel 50 miles at a max speed of 35 mph. I recommend checking your owner's manual to verify this and for any other specific flat towing instructions. For a complete flat towing setup you will...
    view full answer...

  • Parts Needed to Flat Tow a 2017 Buick Envision Behind an RV Using a Falcon 2 Tow Bar
  • The adaptive cruise control in this case does not matter when choosing base plates for a 2017 Buick Envision. The same set, # RM-523188-4, fits both models with and without adaptive cruise control so no worries! The base plates are compatible with the Falcon 2 tow bar # RM-520 that you have. More to the point of your question adaptive cruise control uses what is essentially forward facing radar to detect vehicles in front of you and will adjust the vehicle speed accordingly. On some...
    view full answer...

  • Can Tow Ready Tail Light Diode System # TR118821 be Used with Blue Ox Patriot on 2016 Jeep Wrangler
  • Yes, the Tow Ready Tail Light Isolating Diode System # TR118821 referenced in your question, which is confirmed to fit your 2016 Jeep Wrangler, will work great with the Blue Ox Patriot Braking System # BRK2016 in place. You will not need to worry about any feedback from the vehicle. In order to ensure proper operation though you will need to add the Brake-Lite Relay Kit # RM-88400 so that the Jeep's brake signal doesn't override the turn signal from the RV when applying the brakes during...
    view full answer...

  • Wiring Kit to Flat Tow a 2017 Ford Focus SEL Hatchback with Separate Wiring
  • The differences between the two custom wiring kits you mentioned is the vehicles they are designed to fit. However, neither of them fit your 2017 Ford Focus. Part # HM56200 fits a Jeep Wrangler JK from 2017 and 2018 and part # HM56007 fits a Focus but it's the sedan model from 2012 to 2014. These kits offer a simple plug-in installation behind the vehicle's tail lights. Unfortunately, this option isn't available for your 2017 hatchback. Instead I recommend part # TR118821 that does...
    view full answer...

  • Install Instructions for Tow Ready Tail Light Isolating Diode System TR118821
  • I attached the two sheets of the install instructions for the Tow Ready Kit part # TR118821 that you referenced.
    view full answer...

  • Comparing Tow Ready and Roadmaster Diode Wiring Kits for Flat Towing
  • The biggest difference between the Tow Ready Tail Light Isolating Diode System # TR118821 and the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 is that Tow Ready created their wiring kit with quick disconnects so if you ever get a new vehicle you can take the kit with you. The Roadmaster option can also be removed but you would have to splice all of the wiring again as the quick disconnects don't match up the way the Tow Ready option does. Both are great options and I'm sure...
    view full answer...

  • How Difficult is it to Install the Tow Ready Tail Light Isolating Diode System # TR118821
  • As long as you are used to doing your own work on your vehicle, most of the lighting systems that we have are fairly easy installs. The Tow Ready Tail Light Isolating Diode System # TR118821 will install on your 2017 Chevrolet Spark by splicing the current wiring which send the left brake and left turn, right brake and right turn, and tail lights into the diodes on the Tow Ready System. See attached photo for for illustration.
    view full answer...

  • Locating Correct Wires on 2019 Jeep Cherokee to Install Tow Ready Tail Light System # TR118821
  • The best method for locating the correct wires to splice into on your 2019 Jeep Cherokee when installing the Tow Ready Tail Light Diode System # TR118821 is to simply test them using a circuit tester like # 40376. Going by wire color alone isn't always a good idea as vehicle manufacturers tend to switch up the wire colors used at the factory. What you will want to do is remove the tail lights so you can access the wiring. Then you can have a buddy run through the lighting functions in the...
    view full answer...

  • Willd Tow Ready Tail Light Isolating Diode System Protect Both Motorhome and Towed Vehicle Wiring
  • Yes, the Tow Ready Tail Light Isolating Diode System # TR118821 does work to protect both the electrical on your motorhome and your 2013 Nissan 370z (that you input for your vehicle info). Since your motorhome has combined wiring and your 370z has separate (3-wire system) wiring this means that the brake lights on your 370z will function both as the brake and turn lights (when flat towing). If you would like to retain the separate wiring for when you are flat towing then you would also...
    view full answer...

  • Lights so 2017 Chevy Spark Keeps Separate Turn and Brake Signals
  • If you wanted to ensure your 2017 Chevy Spark had separate brake and turn signals there is an option for you. What you would need is the Tow Ready Tail Light Isolating Diode System # TR118821, Converter # 118158 and Diodes # RM-792. I've added links to video reviews of these products for you to take a look at.
    view full answer...

  • Will the License Plate Light be Activated on a Towed Vehicle Using a Direct Plug In Wiring Harness
  • The direct plug in custom tail light wiring kits for your 2013 Jeep Wrangler Unlimited will illuminate the license plate illumination light on your vehicle when the taillights are activated when the running lights are on. Of the light kits that are confirmed as a fit for your 2013 Jeep Wrangler Unlimited, I recommend the Tow Ready Tail Light Wiring Kit # TR118821. This kit connects to your existing taillight wiring, will supply all the functions that you need, and is controlled by a...
    view full answer...

  • Can the Roadmaster to Blue Ox and Demco Tow Bar Adapter Mount to Flat Bumper on a 2006 Jeep Wrangler
  • The Roadmaster Base Plate to Blue Ox and Demco Tow Bars Adapter, # RM-033, that you referenced must be attached to base plates. The bumper on your 2006 Jeep Wrangler is not rated for towing. I pulled the adapter from my warehouse and found that this adapter measures 33 inches wide x 2 inches tall. For your Jeep you can use the Blue Ox Base Plate Kit, # BX1120, without having to use an adapter for your Blue Ox tow bar. I verified with Blue Ox that these base plates will fit your Jeep...
    view full answer...

  • Solution for Getting Signal Lights for Flat Towing Ford Explorer without Splicing into Wiring
  • I may have a solution for you, however there isn't a custom plug-and-play tow bar wiring option available for your 2013 Ford Explorer like the harness you installed on your friend's Focus. If you don't want to mess with the factory wiring at all on your Explorer another option is a removable tail light kit like the Optronics Heavy Duty Magnetic Tow Lights # TL21RK. This will provide you with the needed tail lights for towing your Explorer without having to splice into its wiring. The...
    view full answer...

  • How To Install a Flat-Tow Wiring Harness on a 2005 Jeep Wrangler with Trailer Wiring Harness
  • I do have options for you but it's largely going to depend on what trailer wiring harness you have installed on your 2005 Jeep Wrangler. The best and most simple solution for you would be to just use a set of magnetic tow lights, the MaxxTow Magnetic Tow Lights part # MT70097. However, we do have hardwire options for you as well. If you have a factory trailer wiring harness then you can use the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles part # HM56202 which is a plug and...
    view full answer...

  • Parts Needed to Flat Tow a 2011 Chevy Silverado 1500 4x4 Behind an RV
  • Yes, you can flat tow a 2011 Chevy Silverado 1500 4x4. Only the 4x4 models can be flat towed with all wheels on the ground. The 2-wheel drive models cannot be flat towed and would have to be put on a trailer. But since you have a 4x4 you don't have to worry about that! There are 5 main parts needed to flat tow a vehicle: base plates, tow bar, safety cables, lighting, and supplemental braking. For base plates you can use Roadmaster MX base plates # 3154-3. I have linked a video showing...
    view full answer...


Do you have a question about this Tow Bar Wiring?




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Info for this part was:

Written by:
Tyler C
Expert Research:
Michael H
Expert Research:
Jameson C
Video by:
Joshua S
Video Edited:
Jacob T
Expert Research:
Adam R
Video by:
Kathleen M
Updated by:
Laura H
Video Edited:
Dustin K
Installed by:
Cole B
Video Edited:
Chris R
Updated by:
Alexander C
Photos by:
Stacy F
Test Fit:
Brent H
Test Fit:
Shane H
Video by:
Jonathan Y
Test Fit:
Robert C
Updated by:
Hannah L

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