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  1. Trailer Wiring
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FITS 2018 Mercedes-Benz GLA
Upgraded Modulite Vehicle Wiring Harness Kit w/ 4-Pole Trailer Connector and Installation Kit

Upgraded Modulite Vehicle Wiring Harness Kit w/ 4-Pole Trailer Connector and Installation Kit

Item # 119147KIT
Our Price: $90.17
Trailer Wiring
Confirmed to Fit
2018 Mercedes-Benz GLA

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Shipping Weight: 1.58 lbs
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Tekonsha Trailer Connectors - 119147KIT
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The best technical support and full trailer wiring installation instructions. Great price GLA trailer wiring and expert service. Mercedes-Benz GLA, 2018 trailer wiring by Tekonsha are available from etrailer.com. For expert service call 1-800-940-8924 to order your Upgraded Modulite Vehicle Wiring Harness Kit w/ 4-Pole Trailer Connector and Installation Kit part number 119147KIT, or order online at etrailer.com.
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2018 Mercedes-Benz GLA - Upgraded Modulite Vehicle Wiring Harness Kit w/ 4-Pole Trailer Connector and Installation Kit

  • Trailer Connectors
  • Vehicle End Connector
  • 4 Flat
  • Plug and Lead
  • Tekonsha

Tekonsha ModuLite Wiring Harness with Powered Converter by Draw-Tite, Hidden Hitch and Reese


Features:

  • Virtually eliminates draw on the vehicle's taillight circuit
  • Works with either LED or incandescent bulbs on both the trailer and vehicle
  • Works with most vehicles multiplex wiring systems for lighting
  • Taillight circuit has been upgraded to work with vehicles using PWM, allowing converter to turn on fully giving trailer maximum light brightness
  • Powers the trailer's stop, turn, tail and running lights directly from the tow vehicle's battery
  • May be used on 2 and 3 wire systems
    • When used on 2 wire systems, brake wire on harness must be grounded
  • Eliminates the need for a heavy duty flasher
  • Includes circuit tester, wire to run to the battery, and (5) quick splices to aid in installation
    • Also includes 4-pole trailer connector cover


Warning: Overloading circuit can cause fires. Do not exceed lower of towing manufacturer rating or:

  • Max. stop/turn light: 1 per side (2.1 amps)
  • Max. tail lights: (7.5 amps)
  • Read vehicle's owners manual and instruction sheet for additional information.

Included with Hardwire Kit:

  • Upgraded Modulite Wiring Harness (# 119147)
  • Modulite Install Kit (# 118151)
    • 20' of 12 gauge wire, ring terminals, and inline fuse for battery connection
  • Circuit Tester
    • To help find wires behind vehicle tail lights to gather signals
  • (5) Quick splice wiring connectors
    • Makes tapping into wires quick and easy
  • Integrated 4-Pole Cover
    • Protects 4-pole connector from the elements and reduces dirt, debris and corrosion for trouble-free use


119148 ModuLite Wiring Harness with Powered Converter and Hardwire Kit with Testers

Installation Details 119147KIT Installation instructions

California residents: click here


Customer Satisfaction Score:


Customer Reviews

Upgraded Modulite Vehicle Wiring Harness Kit w/ 4-Pole Trailer Connector and Installation Kit - 119147KIT

Average Customer Rating:  4.6 out of 5 stars   (179 Customer Reviews)

Tekonsha ModuLite Wiring Harness with Powered Converter by Draw-Tite, Hidden Hitch and Reese

by:

You’re gonna love this! I put the hitch on my Corvette to haul a small luggage trailer on long trips. The hitch works great!




by:
2005 Honda Element

Everything fit perfectly and we (my wife and I) got it all assembled within a couple hours! (We haven't done the wiring yet. That will wait for another day.) Taping the washers to the frame, as was suggested in one review, was most helpful. It was only necessary when attaching the last end, because the bolts had to be pushed all the way back for that end to be put in place.




by:
2013 Volkswagen Jetta Sportwagen

The shipping was quick and free however the packing of the shipping box was very poorly executed. An electronic device, a circuit protected trailer light power module and accessories were shipped in a 10x7x5.5" box with no packing materials to keep the contents from being bounced around in the box which base on the visible crushing of the box was bounced around quite a bid during shipping. Any item shipped needs to be packaged to prevent it from free movement in the box. bouncing around in a box is the worst thing for an electronic device. I hope the module has not been damaged. I ordered this to replace a module that experiences intermittent failure in my vehicle apparently from something damaged in the module.


Comments
Thank you for sharing. I will send this information to our shipping department for review. Please contact us immediately if the harness is not working for you.
-- Etrailer Expert Jenny N - 10/03/2022


by:

Parts fit perfectly and appeared to be good quality.. The video’s were so helpful when applying the products!!! Would highly recommend




by:
2014 Subaru WRX

2014 WRX wagon at taillight: WHT/RED = Turn signal
BLK/WHTstripe = Running light
BRN = Brake light
I mounted the modulator behind the left turn signal. I routed the power wire through the trunk via rubber access plug. I then fished the power wire under rear seat and stuffed it under plastic trim molding along the doors. I went behind left kick panel and then came out and ran it into the fender well, between the door and the fender, and up a structure tube into the engine compartment. The wire is safe from damage and will not be crushed by shutting the door because of the rubber door seal. I ran my XM ant. wire like this also and there are no negative consequences.




by:
2020 Ford EcoSport

Etrailer always comes through with products that are easy to use and at a fair price. The auto trailer wiring kit was easy to install, and works good. All the products I've ordered from etrailer have been great.Great company to do business with.




by:

I haven't installed the hitch or the wiring harness as of yet as I only received everything Thursday in great shape I should add. The wiring looks a little complicated but like I said only yesterday I received it yesterday, but it pretty much looks straight forward.


Comments
The installation isnt terribly difficult, its just a matter of using the included circuit tester to determine which of your taillight harness wires provides which function, then making the appropriate connections. Ill link to a typical installation video which should provide you with some direction. The wire color coding on your vehicle would likely be different from what the video shows, but the procedure would be similar.
-- Etrailer Expert Mike L - 08/19/2022


by:

I've had nothing but great experiences with etrailer in ordering and installing 2 hitches on my 2 MB SUV's, this was no different. Good product, easy to follow/logical instructions and excellent customer service


Comments
1 year on and still very happy with hitch and harness. Works perfectly towing my boat mostly - ab out 3100 lbs with the trailer
Adrian - 07/07/2022


by:
2011 Land Rover LR2

Unit easy to install if you watch the video first and take notes on which light wire in the car goes with the appropriate wire on the module.

Quick shipping with constantly updated tracking information.


Comments
The videos are fantastic! Even if we do not have your exact year, make, or model, they will still be helpful. Not all wiring is the same, but on this module the green wire is the passenger turn signal. The yellow wire is driver turn signal. The brown wire is the tail light. The red wire is the stop signal, if you have separate lights from the turn signals. If it is not separate, just ground the red wire. The white wire is a ground and the black wire is ran to the battery positive.
-- Etrailer Expert Sierra K - 05/24/2022


by:

This is the second tow hitch I have ordered. It has such an easy install for both, one for a honda cvr, the other for a mercedes ml350, the easiest installs I have ever had!!




by:

My wife took this picture of my Son and I working on a truck the other day. We were installing electrical connections we had recently ordered from you guys for a truck that has a new hitch on it that also came from you guys. One of your boxes is in the photo. Figured you would appreciate it. I am sitting on the ground with my head up under the truck Good times!
[Thumbs up]




by:

Part installed as advertised. Works gre at!




by:
2005 Volkswagen Passat

It feels heavy duty and is working exactly as it should. Easy wiring in my 2005 Passat TDI. The most difficult part was bring the 12ga wire from the battery to the rear of the vehicle. The effort was worth it; I have a professional looking install that works perfectly.


Comments
The product works perfectly. A year later it still looks and works like a factory installed item.
Eric P - 05/03/2014


by:

I received a box with the module, some wire taps, zip ties and a separate package of power wire. No instruction no any kind of paper work.




by:
2013 Toyota Prius

I recommend the Tow-Ready 119147KIT instead of the Curt Model for a 2013 Prius. I had to return the Curt Kit because the running lights/tail light stayed on all the time even with the vehicle off. Sometimes there wasn’t a tail/running light on if you reset the converter by removing and re-installing the fuse. This Tow-Ready model works like it should. You'll need 12 gauge wire to run from the battery, (right side hatch area,) to this unit which will need to be mounted on the driver’s side, rear hatch. At the very top of the left rear tail light are covered wires going into a plug. The Blue is the Stop light and the Brown is the tail/running light. (Be careful since these wires are thin solid copper wires.) Left turn signal is the green/yellow stripe wire and on the right side rear lamp the right turn signal is also the green/yellow stripe wire. You will need to remove the left rear panel to get to the blue and brown wires. Remove the bottom tray cover, the bottom tray as well as the left rear plastic tray and the plastic bottom hatch trim over the latch assembly. Remove the Phillips screw on the left rear panel as well as the chrome tie down clamp. This sounds harder than it really is. Good luck!


Comments
Thanks for the installation details. I also have a 2013 Prius and everything went a lot smoother with your information. I didnt even need a test light.
-- comment by: BBOWL - 06/23/2014
I agree - very helpful information on installing on a 2013 Toyota Prius. This told me which wire was which light and even gave helpful tips on removing the panels that I was sure I couldnt do, until I read what you wrote. Thank you so much- saved me lots of irritation.
-- comment by: Kathy C - 06/27/2014


by:

GREETINGS,
YOU GUYS ARE GREAT! I WAS
APREHENSIVE ABOUT WHETHER OR NOT THIS KIT WOULD WORK ON MY 2005 HONDA ELEMENT DUE TO HONDA'S OEM TRAILER HARNESS (NO LONGER AVAIABLE)BEING SO TECHNICAL WITH DIFFERENT HARNESSES FOR DIFFERENT YEAR ELEMENT MODELS. YOUR KIT WAS SPOT ON AND BEING ABLE TO GO TO YOUR WEBSITE ACCESS THE VIDEO TUTORIAL WAS ALL I NEEDED TO HAVE A PAINLESS INSTALL, FUNCTIONING RIGHT AND PORPER ON THE FIRST TRY. THANKS FOR MAKING MY GARAGE TIME ON THIS PROJECT STRESS FREE!!!




by:
2007 Toyota Sequoia

Comprehensive kit - came with everything needed for easy installation! Would highly recommend for anyone needing to power vehicle trailer lights. The online PDF was very helpful as well to see the wiring diagram and be able to view >100% for those with difficulty reading the paper instructions :)




by:

This kit lacks any type of instruction in the package but appears complete. At the price I expect clear instruction without needing to look for them online. The leads on the module are about 5 or 6 ft too short to be of use on the 2022 Sorento PHEV SX I have, ground and power are only identified on your installation video. As well, the splices provided are for wires larger that in that vehicle leading to failed connections on each wire!For the price I paid I certainly expected that I would NOT have to scour several local shops for the parts to finish the job nor to have to refer and search necessary information!.


Comments
I will have our customer service team reach out to you. This harness is a hardwire harness that works with a variety of vehicles. I recommend taking a look at the installation video that we have on a 2019 Hyundai Tuscon. I also recommend checking to see what gauge of wire your vehicle uses. The provided blue taps are for 16-18 gauge wire only.
-- Etrailer Expert Jenny N - 12/16/2021


by:
2022 Mercedes-Benz GLC

Easy and quick installation, works grea t!




by:
2019 Chevrolet Camaro

Ordered this, together with a hitch receiver. etrailer waited a month to update the delivery date for the hitch receiver to 3 months ahead, so I canceled the hitch receiver and requested they send me this Upgraded Modulite vehicle wiring harness kit, which came incomplete. I called and got the rest of the items sent, which took another week. Hopefully installation goes as indicated int he instructions.




by:
Kia Sorento

Great kit. Installed in 2021 Kia Sorento. Would advise soldering the wires into harness instead of using the crimp connectors. Fits well in same compartment as tire kit under back deck. Would be nice if the manufacturer instructions were included. Other than that, very happy with it.




by:

Guality stuff. etrailer.com is the only place I buy trailer stuff.




by:
Lexus

I purchased a trailer and connector for my Lexus NX300 Hybrid and it works well!! The Lexus dealer told me I could not add a trailer or I would lose the ability to use my foot to automatically open up the trunk (sensor). However your team told me that I could have the trailer and not lose access. Your team was correct and the trailer has come in handy. We have not carried anything on the hitch yet, but know we can if needed. Also, the trailer is very nice looking... you can barely notice it.




by:
2014 Lexus RX 350

Just completed the installation of the 119147KIT on a 2014 Lexus RX350 and it works great. Everything needed was included in the kit and the installation process was fairly easy. As always when I purchase items from e-trailer things fit and the right amount of supplies are included as well as installation instructions. i have always had excellent service from e-trailer and have great confidence in doing business with e-trailer. I know that i will get a great product with support, if needed, and always a follow up e- mail to see if everything was OK.
Great place to shop.


Comments
This was installed on a Lexus that does not have the factory tow package. It work just fine and has had no negative effect on the vehicle. Note, I tow a very small utility trailer on short trips and wanted the lights on the trailer to work properly.
Hans H - 01/28/2017


by:
2014 Lexus RX 350

My RX350 Lexus did not have a towing package, and I used this kit for getting all the trailer lights to work. It took me a little more time to make the electrical connections as I needed to probe individual wires to ensure I was connected to the correct wires. Once completed, everything worked fine and still does. Glad I did it.


Comments
Still works.......
Dave S - 07/06/2018

25
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Show More Reviews

See what our Experts say about this Tekonsha Trailer Wiring

  • Difference Between the 119147 and 119147KIT Trailer Wiring Harness for a 2006 Volvo XC70
    The # 119147 and # 119147KIT are the same part with the only difference being that the # 119147KIT provides the installation kit that includes the wire needed to connect the converter to the vehicle's positive battery terminal, the fuse holder, the fuse, the installation hardware and the circuit tester to help determine which taillight circuit carries which taillight function. The # 119147 only includes the powered taillight converter and none of the equipment needed to install it.
    view full answer...
  • Difference Between Tekonsha Trailer Wiring Harness # 119147 and # 119147KIT
    You're correct. Using the 'KIT' suffix after the part number provides the power wire feed to the vehicle battery and the fuse holder, which you won't need (assuming that your existing power feed and fuse holder are in good shape). The # 119147 is exactly what you'd need. However, before installing the replacement, you'll want to closely examine the wiring on the trailer to determine if there was a short in the trailer wiring that caused the converter's demise.
    view full answer...
  • Troubleshooting Trailer Running Lights Staying On when Vehicle is Turned Off
    It sounds as though there is a short or something is mis-wired. Using a circuit tester, like the Quickee # 3808, check the connection points in the vehicle side connector, to see if there is constant power on the running light circuit (brown wire on the 4-Way) when the vehicle and lights are turned off. There should be no signal when the lights are off, and a signal when they are on. If there is a signal with the lights off, then there is a problem on the vehicle side. Check to make sure...
    view full answer...
  • Difference Between Tekonsha Wiring Harness 119147 and 119148
    The Tekonsha # 119147KIT (Tekonsha part number 119148) is the full kit with everything needed for installation. The # 119147 only has the Upgraded Modulite Wiring Harness. The # 119147 is part of the kit. The kit includes the the 12 gauge wire, ring terminals, inline fuse holder and fuse, quick splices, cable ties, self-tapping screw, butt connectors, and 4-pole cover.
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  • Recommended Wiring Harness For 2017 Santa Fe 2.0T Sport
    Most new cars do have factory wiring quick connects, however your 2017 Hyundai Santa Fe Sport does not. For your trailer wiring, I recommend the Tekonsha Upgraded Modulite Vehicle Wiring Harness Kit with 4 Pole Trailer Connector (Includes Install Kit) # 119147KIT. This kit uses the quick splice connections to make the installation without those quick connects easy. You will need to run a power wire from your battery to protect your factory system from overload. This is the case with...
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  • How to Install Tekonsha Wiring Harness 119147KIT on Vehicle with 3 Wire System
    If your tow vehicle has a 3 wire system, this means the vehicle's turn, brake and tail light function are on separate wires. When installing the Tekonsha Upgraded Vehicle Wiring Harness # 119147KIT referenced in your question, you will use the following connections: The yellow wire will go to the left turn wire. The green wire will go to the vehicle right turn wire. The brown wire will go to the vehicle tail light wire. The red wire will go to the vehicle brake wire. I have attached...
    view full answer...
    Image 1 for
  • Trailer Wiring Recommendation for 2000 Nissan Xterra
    We have trailer wiring that fits your 2000 Nissan Xterra but it's universal trailer wiring so it requires hardwiring. For that you'd want the part # 119147KIT which is confirmed as a fit and would work well.
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  • Recommended Trailer Wiring Harness for 2011 Acura TSX Sport Wagon
    The Tekonsha Upgraded Protected ModuLite with 4 Pole Harness # 119147KIT referenced in your question is indeed confirmed to fit your 2011 Acura TSX Sport Wagon. This is a universal hardwire kit that includes a circuit tester to help with installation. Once installed, this will provide a 4-Way connector at the rear of your vehicle to power your trailer's signal lights. I have also included the installation details for you to check out and linked to a video that will give an overview of...
    view full answer...
  • Converting a 6-Way on a Honda Goldwing GL1800 to a 4-Way for Towing a Trailer
    We have exactly what you need in the Tekonsha Upgraded Circuit Protected ModuLite with 4 Pole Harness and Hardwire Kit # 119147KIT. Since your Honda Goldwing GL1800 has the stop light function separate from the turn lights you need this kit to combine the stop and turn signals like how your trailer is wired. To install it you will need to connect the following wires to the following functions on your Goldwing: Green - Right Turn Yellow - Left Turn Brown - Running/Tail Lights Thin Red...
    view full answer...
  • Recommended Trailer Wiring Harness for 1988 Toyota Pickup
    We do have a couple universal harnesses that are confirmed to fit, however there is not a custom, plug and play style wiring harness available for your 1988 Toyota Pickup. To install a 4-Way connector, I recommend the Tekonsha Upgraded Circuit Protected ModuLite Harness # 119147KIT. This is a hardwire kit that features a ModuLite Protector with integrated circuit and overload protection to safeguard both the harness itself and your truck against shorts or miswiring. A circuit tester is...
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  • Recommendation For Trailer Wiring Harness For 2018 Honda Civic Hatchback
    I recommend the Tekonsha Upgraded Circuit Protected ModuLite with 4-Pole Harness and Hardware Kit, Item # 119147KIT, for a user friendly option for your situation. This Tekonsha harness is a confirmed fit for your 2018 Honda Civic Hatchback. The ModuLite Ultra Protector will safeguard your Honda Civic from electrical shorts or mis-wiring situations. It has very little power draw and everything you need for installation is in the kit including a circuit tester to help you identify wires....
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  • Recommended 4-Pole Trailer Wiring Kit for 2003 Volkswagon Passat
    The three brands of 4-pole trailer wiring harness we offer for your 2003 Volkswagen Passat install in the same manner so there is no one kit that is any easier to wire than another. However, we have found that the Tekonsha brand wiring products tend to me more reliable than some others so we typically recommend this brand. For your 2003 Passat you will use kit # 119147KIT. I linked the written instructions, an article and some videos to help.
    view full answer...
  • Recommended 4-Way Trailer Wiring Harness for 1999 Chevy Silverado
    For your 1999 Chevy Silverado, there is a 4-way that can be spliced in behind your tail lights with quick splice connectors, but there is not a T-style connector. For your application I recommend the Tekonsha Upgraded Modulite Vehicle Wiring Harness Kit with 4 Pole Trailer Connector (Includes Install Kit) # 119147KIT. This will install in a very similar way to the T-connectors and will require connection to your battery for power.
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  • Recommended Wiring Harness for Adding Hard bags with Led Lights to 2003 Honda VTX 1800
    You most likely just need to splice into your current rear signals for function. The issue is only if you want to combine functions like a trailer. In that case, you would need the Tekonsha ModuLite Ultra Protector Wiring Harness w/ Integrated Circuit and Overload Protection # 119147KIT. This will be compatible with LED lights.
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  • Trailer Lighting Fuse Locations in 2018 Ram 3500
    According to the online owner's manual for the 2018 Ram 3500, the fuses related to trailer lighting and trailer power are below. The fuse location, fuse value and function are listed for you. F81 20 Amp Yellow Trailer Tow Right Turn/Stop Lights F53 20 Amp Yellow Trailer Tow – Left Turn/Stop Lights F28 20 Amp Blue Trailer Tow Backup Lights – If Equipped F29 20 Amp Blue Trailer Tow Parking Lights – If Equipped F30 30 Amp Pink Trailer Tow Receptacle I'll also link you to a wiring troubleshooting...
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  • Tip for Finding Running Light Circuit of 2017 Chevy Bolt EV for Trailer Wiring Install
    You'll have to source the running light circuit wherever it happens to be. If you can find the wire color by looking at the back of the socket on the hatch you might have luck using the color to find it in a more accessible location.
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  • Which Tekonsha Trailer Wiring Kit Fits 2002 2002 Mercedes E320
    The taillight configuration of your 2002 Mercedes E320 has separate wiring. The brake and turn signals are sent along separate wires. You don't have BT or BTT designations which refer to multiplex style wiring so the # 119147KIT would work well.
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  • How Does the Tow Ready Wiring Harness part # 119179KIT Install on a 2008 Chevy Malibu
    Since you have determined that your 2008 Chevy Malibu has a 2 wire (combined) taillight system you will need to ground both the red and the white wire of the # install harness part # 119147KIT. Aside from that you will install the brown wire of the harness to your taillight circuit, the green to your right stop/turn, and the yellow to your left stop/turn. The brown wire you found on your vehicle taillights shouldn't be carrying both your turn signal circuits and your running light circuits...
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  • Availability of Trailer Wiring Harness for 2012 Mercedes-Benz M-Class
    We do offer a hardwired solution for installing a 4 pole trailer wiring harness on your 2012 Mercedes-Benz M-Class. I'd recommend the Tekonsha powered taillight converter, part # 119147KIT.
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  • Trailer Brake Lights Not Working On a Trailer Towed by a 2003 Saab 9-3
    There are a few possibilities as to why the trailer brake lights are not working. First, you will need to make sure that you have the wiring from the harness connected to the proper wires on the 2003 Saab 9-3. The # 119147KIT harness can be wired in different ways depending on how the vehicle tail lights are wired. To determine if the vehicle is the problem: You will need to determine if the vehicle has a 2 wire or 3 wire system. A 2 wire system will have the same bulb for stop and turn...
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  • Trailer Wiring Harness for a 2008 Volkswagen Touareg V6
    If you install the Tekonsha # 119147KIT, according to the installation instructions linked for reference, you should not have to worry about the trailer connection causing error codes. This wiring harness gets the power for the trailer lights from the vehicle battery but the signals to tell the trailer light what to do still come from the vehicle tail light wiring, so the harness will need to completely installed to work.
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  • How To Install Tow Ready Wiring # 119179KIT On 2005 Infiniti FX35
    The wires you will need to locate to install the Tow Ready Wiring, part # 119147KIT, on your 2005 Infiniti FX-35 are located behind the tail light assemblies. You may need to remove the tail light assembly and the plastic trim pieces. You will need to use the included circuit tester to test the wires for function. You will want to have a friend operate the lights, turn signal and brakes while the vehicle is in park, parking brake engaged and the key is in the on position. The White wire...
    view full answer...
  • Installation of 4-Pole Hardwire Kit for a 2004 Lincoln Town Car Towing a Trailer with Only 2 Lights
    For a small trailer with only two lights, I would recommend hardwire kit part # 119147KIT. It includes a tester and quick splices so you will have everything you need to find the right wires to tap into. We have an installation video of a similar part being installed on a 1999 Ford Crown Victoria that should be helpful. I will add a link to it below.
    view full answer...
  • Wiring Converter for a 2005 Chevy Avalanche
    The tail light converter that you will want for your 2005 Chevy Avalanche is the Tow Ready Modulite Wiring Harness, # 119147KIT. The converter in this harness will take the separate turn signal and brake light signal and combine the on one circuit for your trailer.
    view full answer...


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