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This ModuLite harness offers peace of mind by including circuit protection to safeguard itself and the tow vehicle from harmful electrical shorts and mis-wire situations. The upgrade also includes the ability to work with PWM on vehicles.
Features:
Warning: Overloading circuits can cause fires. Do not exceed:
Read vehicle's owners manual and instruction sheet for additional information.
Average Customer Rating: 4.6 out of 5 stars (425 Customer Reviews)
This ModuLite harness offers peace of mind by including circuit protection to safeguard itself and the tow vehicle from harmful electrical shorts and mis-wire situations. The upgrade also includes the ability to work with PWM on vehicles.I am a DIY guy who does not have any experience on electrical. Got it today, and installed in with not much issue. I went online/youtube to get more information etc. Took me a while to figure out the circuit tester that came with you kit was not working at all. I ended up buying a tester from [online], which basically confirmed that the tester came with the kit was defective.
Jenny N - 02/20/2022
MATD - 02/16/2023There is no where at attach the wire harness it just dangles
Mike L - 09/15/2022Install on 2018 Mercedes Benz CLA250 w/LED tail lights:
There were no guides I could find so I'm posting this for other etrailer customers.
These are my installation notes and the kit operates correctly. There are other ways to do this, I'm sure.
It isn't necessary to remove the tail lights, there is a removable piece in the trunk carpet. I removed that and the plastic trim panel in the middle.
The tail lights have 10-pin connectors. On the left there are 8 wires on the right there are 7. My thought is maybe this has something to do with the european style parking lights. After probing I found this:
Left Side:
Turn/Brake - Yellow with White stripe
Running/headlights - Black with Orange stripe
There is constant power to the Green with White stripe
Right Side:
Turn/Brake - Light Blue with Red
There is constant power to the Green with White stripe
I had to splice additional wire to mount the module where I wanted it. The final connections were:
Module Brown to Left Black/Orange
Module Yellow to Left Yellow/White
Module Green to Right Light Blue/Red
Module White to Ground
Module Black to Battery
Module Red Terminated (unused)
The positive electrical connection I made was under the hood, off the fuse box. Terminated to one of the lugs, covered with wire loom, and run into one of the cars wire bunches.
The 4-wire hitch output is terminated with a CURT tester (If you put one there, you'll always know where it is when you need to troubleshoot something)
This vehicle is completely covered on the bottom and running the wire can be very time consuming if you want it to look tidy.
This kit was great and functions exactly as intended. With the help of the online video it was easy to install, even for people without any electrical knowledge.
My only advice is:
1) watch the video and the hitch installation video at the same time. This will help you plan ahead and not re-install parts during the hitch installation, that will need to be removed for the harness installation
2) be VERY careful about selecting the right wires, by using the testing tool eTrailer provides. In the install video for my BMW X5, the technician referenced a yellow and black wire when making the initial connection. He later goes on to make a separate connection for a black and yellow wire. To the novice they look nearly identical. I confused the two wires and had to re-do this, but would not have been an issue if I had understood the distinction and used the testing tool, as recommended in the instructions
3) be careful about placing all connectors so that they face in the same direction. Does not impact function, but makes for a neater install when complete.
I could not be happier about how this project turned out, and credit etrailer with all of the success. It has a very OEM look, and etrailer made the entire project doable for me through their great suite of videos and excellent Customer service. I wish every retailer could be this good!
I've had my hitch for a year now and have been very happy with it. It is strong and easy to use. Being a young woman it was a little intimidating for me to tow a trailer, but I feel confident in the product and haven't had any issues with it.
The only reason I am not giving this 5 starts is the power wire that runs to the battery was 1 foot too short and I had to buy more wire to extend it. Otherwise very good it and functions properly. I did not use the quick connectors and decided I wanted a more secure long-lasting connection then crimping onto vital brake light wires.
It took some time and trouble to figure out how this correlates to the installation video (for the Curt model, which has fewer wires). Once the right wires were identified, it was very simple and straightforward. The system works like a charm, and I've already towed a U-Haul trailer. Depending on the vehicle, I would recommend getting some 3/8" wire loom ($1.99 @ Home Depot) to protect the power wire from abrasion/cuts if you route it along your car's underbody. The included instructions (online & paper) are too generic to be useful, and the vehicle wiring codes (types of wire systems: 2-wire, 3-wire pulse, etc.) don't have a reference on the TowReady website. Moderate gripes, but some streamlining would've saved me unnecessary troubleshooting. All the parts you need are included, with extras just in case.
The product works great. The worst thing about it was that there were no instructions with it at all. I had to email etrailer and they in turn emailed me the instructions. Other that that no problems. Fast shipping and product is as advertised.
I used this product on my Victory Vision so that I could pull my trailer. Below is a picture of where I placed it. It worked out best in my opinion to velcro it to the back of the saddle bag. It actually mounted right under the wiring harness of the bike that I had to tie into.
Damon C - 12/18/2014Everything you need to perform the wiring installation like a pro. I also purchased the circuit tester which I highly recommend. Brophy Circuit Tester for 4-Pole Flat Trailer Connector item #F4CT
I installed my unit on a 2013 Audi a4 quattro sedan. using the provided tester I determined it is a two wire system. i installed unit in driver side outside of trunk. I easily snaked the green wire through trunk to passenger side chamber. The battery is in the trunk, so it was easy to connect supplied fuse connector directly to battery. Wiring:
Unit green wire to gray/blue wire on passenger side
Unit Yellow wire to gray/white wire on drivers side
Unit Brown to Green wire on drivers side. No drilling needed
Ran trailer wire into trunk and out through cut out on trim where hitch is
Works perfectly.
Reason for not a 5: No directions and missing 1 crimp connector.
Laura E - 03/15/2017Great product, easy to install and easy to follow instructions.
The quality is great and the install videos are awesome thanks!
Alan - 10/16/2022thanks for being so helpful in switching us into this heavy duty wiring harness. The service was better than all face to face places in this type of business. My installer swapped out the modules and everything worked perfectly. I can't say enough about both customer service and the tech support that we received. There should really be a sixth star (for above and beyond)!
Doug L - 01/16/2018A module such as this is absolutely essential when trying to add a trailer lighting circuit to a modern CANbus equipped vehicle. The module itself works beautifully but I deviated from the eTrailer install video for my '13 Jetta Wagon.
First, I used the 'poke-n-wrap' method with solder to attach the module's signaling wires to the vehicle wiring harness. I have a personal aversion to Scotchlok or vamp connections because they often fail with time and vibration. This method keeps the harness relatively compact and clean looking, especially if you resecure everything with cloth wiring harness tape.
Second, no self drilling screws. I attached the module to the chassis with proper self adhesive tape like 3M VHB. The white ground wire is easily attached to the existing grounding lug on the left rear wheel well, so no self drilling screw there either. Don't poke holes in your chassis with self drilling screws if you can avoid it.
I avoided drilling a hole in the spare tire well by running the power wire through the existing body plug in the area aft of the right rear wheel well. It's easy to remove the plug, drill a hole in it, and thread the wire through. Add a dab of black RTV to make sure it's watertight.
When powering the module, the suggested method is to split the 1/4" ring terminal and stuff it under the nut that holds the positive battery terminal in place. Instead, I obtained an M6x1.25 nut and secured the fuse holder to a unused, unfused stud on the terminal block inside the underhood fuse block. When it's time to change the car's battery, the split ring will inevitably get deformed and may cause problems. This way, the positive terminal clamp only has to do one thing: hold onto the positive terminal.
To bring the wiring harness outside the wagon I went a little off the deep end with a little sheet metal work and Molex MX150 connectors to make the passthrough watertight. I added etrailer 18140 and 18144 to mount the 4-way connector to the hitch so I wouldn't have to fish the wire out of the left-side trunk compartment and shut the tailgate on it every time I wanted to tow.
Great product: installed on my 2013 Mini Cooper Hardtop quite easily. I had called Trailercraft to install & was told there wasn't a hitch made for my Mini, & if there was one they would charge $1,000 to install it. DYI video was easy to follow.
The link for the You Tube video was something I found. It would have been better to have a link sent with the order for the vehicle model and year specified. I was ready to send it back,, but then I found the video by doing a Google search.
The splice connectors are very finicky. One must be sure to have the small wire positioned very carefully so that the clip catches it and does not push it to the outside of the clip.
I am pleased with my experience with ordering and installing this wiring kit. Prompt delivery, good updates on shipment progress, quality product, great instructions. Where the individual vehicle owner is either familiar with basic electrical installations or willing to learn, I feel the installation is not difficult.
Perfect ! First time I install a hitch and this kind of electric Harness. I was a little confuse on what to do first but well explain and it went very well.
Tips : On my Tesla model 3 2020 there was a 12v plug already coming directly from the 12v battery in front, so it was a lot easier then passing this cable my self. The cable is in the bumper, you should see it if you install the hitch :-)
I own a company and I work with computer, so nothing to do with mechanics and electronics. Just study the plan, watch videos online. Once you understand exactly how it works, it's pretty easy to install.
The harness works perfectly with my 2015 Honda Fit and installation was pretty solid, especially now since Honda makes interior clips easy to remove.
I had trouble with the wiring at first due to having the 3 wire system, but after giving etrailer a call during the install I was walked through which colors go where (I was watching the 2014 VW Passat video where they say to make the red wire the extra ground, don't do it with the Fit! It's the brake light FYI).
No instructions included, just check out the sample videos on this page for the install on other similar vehicles.
We purchased the custom Drawtite hitch and wiring harness to help pull along our hot dog stand (Gnar Dog's Hot Dog Stand) in the greater Cincinnati Area. Couldn't be in business without etrailer; thanks guys!
Thank you E-trailer for my heavy duty Modulite wiring harness with installation kit. Looking forward to using this high quality product.
The kit was fine. It was missing a couple of ring connectors and test light will require some additional wire to use it. The video on your site was very helpful. One more suggestion would be to use electrical tape instead of the zip ties where the wiring must be routed next to the hatch hinge. if there is tension the zip ties might break, but the tape will flex a bit.
Jenny N - 01/17/2022Very easy to install.
L. H - 01/19/2023wiring harness,2 shops refused to insta ll.
The kit had everything needed to do the job. It was installed on a BMW X3 and went together easily as the components were high quality. It did not upset the BMW sensing systems for anomalies which was great.
They were great help ...
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