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Custom Fit Vehicle Wiring > 2010 > Toyota > RAV4

Tow Ready Custom Fit Vehicle Wiring for the 2010 Toyota RAV4

Tow Ready Custom Fit Vehicle Wiring

ratingratingratingratingrating (141 reviews)


Code:   118412

Retail:$69.84

Price:$52.95


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Shipping Weight: 2 pounds

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T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 2010 Toyota RAV4

Quickly and easily install a 4-way trailer connector on your Toyota RAV4 with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.

Features:

  • Provides a 4-way flat trailer connector at the back of your Toyota RAV4 to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points in rear cargo area
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite to ensure that your Toyota RAV4's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 4.2 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your Toyota RAV4's wiring harness, which is located behind the driver's-side and passenger's-side interior trim panels in your rear cargo area. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.


Once installation is complete, the 4-way flat connector will be stowed in an out-of-the-way location within your cargo area.


It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.


ModuLite Powered Tail Light Converter

A ModuLite power module is built into this T-One connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your Toyota RAV4's three-wire system need to be combined so they are compatible with the wiring system of your trailer. This power module functions as a tail light converter to combine the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your Toyota RAV4 operate.


With a ModuLite, your trailer's lights will be powered without overloading your Toyota RAV4's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.



118412 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite



Video of T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector


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

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Video Transcript for Trailer Wiring Harness Installation - 2010 Toyota RAV4

Today on this 2010 Toyota RAV4 we are going to install part number 118412 from Tow Ready. The first thing we need to do is get into the back of the vehicle so we can get access to our tail light harness. To begin our install we are going to have to remove some interior panels. We can fold this up out of the way. Now we want to get to this rear threshold and we want to remove that because we will be running a wire all the way across. We will use a trim panel tool to remove the rivets. Lets remove this access cover and next we need to remove this whole panel. We do not actually have to remove it but what we are going to do is pull it out so it is easier to slip the wires from back here out the other side. We need to remove this tie down point and this screw. Pop it loose. We are going to leave that alone for now and go over to the passenger side and do the same thing again. 01:14

We are going to lay out our harness. We are going to point out that the yellow and brown are going to the left side of the vehicle and the red and green will go to the right side of the vehicle. We will start with the left side. What we are going to do is take the wire harness and the module and we are going to tuck it in the access hole for now. Leave the 4-pole wire harness hanging out. We are going to make our connection to the tail light assembly with this part of the T-One Connector with the yellow and brown wires. Our connection point is back up in here into the back of the tail light itself. You want to take it apart, there is a little tab that you have to feel for and push down on it and it comes apart. You should have a matching end like that. This part here will go back into the tail light. 02:06

Next we are going to take the part with the red and green wires and we are going to push it behind the plastic and pull it out from the bottom. We are going to take our wire and run it all the way across then slip it behind the plastic again. Pull it out the opening of the access panel and one more time we will go in behind the tail light itself and pull out the plug. When we have got our connections made we will reinstall the side interior panels and pop those back into place and reattach the screw and the tie down point. Put the access panel back together too. We will reinstall the threshold and the panel. The wires are just basically going to hide back there and it will be perfectly fine. Lets push it all back down. The next part we will deal with is the actual ground. That will be the white wire with the ring terminal and there is a body assembly bolt back up in here that we can use for a good ground. If we have to we can just peel back the wire a little bit to get the room we need. We will pull the module out and find a place to secure it and on the other side of this plastic is a good spot we can adhere the module to. Tuck those out of the way and that will be just fine. One more wire we need to worry about is the red wire coming out of the module and the red wire has to have a constant 12 volt power supply. We have to connect this up to the battery itself. It is not a good idea to hook up to a 12 volt power supply back here. Basically the module could use more current than what this circuit is designed for. If you pull too much current through this outlet chances are it could damage the wire harness. 04:34

We will run the black wire that comes with the kit up to the battery. What I think we will do is pop out this grommet right back behind here, poke a hole through this rubber grommet. We are going to use a pocket knife and make a slit in it. It is kind of thick in the middle so we will take a few tries at it. Give it a quick test fit and that will work just fine. We are going to take our wire and run it through the hole and then pull it out the bottom and take up all the slack. We have got our grommet still on here so push it down and push it back into place. With the two wires we are going to connect the two together using the supplied butt connector. Just tuck that out of the way too. The next thing we will do is route our wire up to the battery. What we did is we came down from the inside of the body work and just follow the factory wiring harness. Then there is a tube of the subframe assembly for the suspension components we just push it right down the tube. It came all the way out down here and came out above the gas tank and behind the shield and then we are up to the front suspension components and we just push the rest of the wire up into the engine compartment and from there we will reach down and pull the wires out. 06:21

When we pull the wires up make sure it is not dragging against anything that will be moving like the suspension components or steering linkage. Pull it up the way we want it and then we will probably tie it off to the factory harness right here. Next we will route this wire any way we see fit and we will run over to the positive side of the battery. We will cut our wire to the length that we want. Then on to that we will add the fuse holder which is this part right here. All we have got to do is cut the wire in half and we are going to install a butt connector on one side and a ring terminal on the other. Go back to the black wire. We are going to add it to the positive terminal right here. We can use this nut right here on this post and it will work just fine. Next we will remove our negative terminal before we work on our battery that way we do not get any unwanted sparks. Add a ring terminal to the positive side and then tighten it back down. Slip the cover back into place and then we will reattach the ground terminal. Lets add the fuse to the fuse holder and then we will be done with our install. Now we have got our wire harness ready and we will show you how to use it. Since it is on the inside what you need to do is just pull it out just a little bit and we can shut our door on it. The door seal is so thick that it will not hurt the wire when you close the door on it. At that point you can still pull out what you need to reach your trailer wiring. When we are not using it we can hide the whole harness inside the access panel. It is safe and out of the way and you do not have to worry about it sitting outside and getting corroded in the elements. With that, that will finish our install of part number 118412 from Tow Ready.


Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118412

Average Customer Rating:  ratingratingratingratingrating4.7 out of 5 stars   (141 Customer Reviews)




- 118412

ratingratingratingratingrating by: David05/11/2011

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Trailer wiring kit was easy to install. Directions were easy to follow. My 2011 Rav 4 came with an accessory outlet in the drivers side rear panel right by the tail light assembly (see photo). The amperage max for the outlet was over what the lights on the trailer pulls so I spliced into the hot wire and drilled a ground connection nearby. My ATV hauler trailer lights work fine. My only complaint (and it is a small one) about the kit was that the wire lengths going to the other side of the car were BARELY adequate to reach even taking the shortest possible route The directions say to route the trailer plug wire out the door when used. I preferred to have the trailer plug mounted to the hitch rather than routed out the door. So I found a factory rubber drain plug grommet in the bottom of the rear storage area (where the spare tire goes if you don't have a rear door mounted tire like I do -- see photo). I took out the plug, cut a cross slit in it, cut the trailer wires and fed them through under the carpet, re-spliced the wires with wire connectors (and sealed them with dielectric grease to prevent oxidation) so that the splices occurred on the inside of the vehicle, sealed the rubber grommet with some black silicone and mounted the plug to the hitch with an angle bracket mount that accepts a standard 4 pin connector I got from the local U-haul dealer for $1.75(see photo). 13410



- 118412

ratingratingratingratingrating by: Mark03/24/2012

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With impact wrench and another hand installed in 5 min. Spent most time having to clean threads for bolts. 35011



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ratingratingratingratingrating by: Don Soring11/08/2011

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Received my hitch, trailer tire, and wiring kit for our 2009 Rav4 this afternoon about 1:30. Because I had already checked out the installation process on he etrailer website. Everything went just as indicated so it was no problem. One pre-drilled and tapped hole in the frame was a bit rusty but I was also prepared fo that and I used a toothbrush with WD4 to clean the threads then chased that with one of the old bolts so not to mess with the threads of the new bolts. Believe me, etrailer has this stuff already figured out and there are few to no "unexpected" surprises. This was the 3rd etrailer hitch I've installed and all have proven to be very easy. 26705



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ratingratingratingratingrating by: Tony K.08/10/2013

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the wire from module to passenger side tail light needs to be 12 inches longer, and the 4 pin connector does not fit into the hole to lead out to your hitch. 94352



- 118412

ratingratingratingratingrating by: Steve L.05/05/2011

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I had no problems installing this kit. The time it takes will depend on your experience. I spent about 2 1/2 hours total, but that included gathering everything I needed, fussing with tie wraps, finding a route for the power connection, and a final test. One thing I'd like to point out is that it's not hard to run the power wire inside the vehicle. The trim pieces at the bottom of the driver and passenger doors pop off easily. While you have the rear panel loose, fish a wire from the rear area to the bottom of the passenger's door. Run the wire along the door sills up under the dash, where there's another small trim piece that pops off easily. Look up behind the OBD connector and you will see a large rubber gasket which passes most of the wires through the firewall. There is a spare slot in this at about the 2 o'clock position. I pushed a fish tape through this and it popped out just above the strut mount in the engine bay. With a little fiddling, I was able to route the 10ga power wire along side the main bundle of wires, around the engine bay and to the battery. Now I don't ever have to worry about having a loose wire under the car. 12925



- 118412

ratingratingratingratingrating by: Chris M.05/14/2011

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This lighting module works perfectly. The instructions that came with it were clear and pertinent for my specific year of vehicle, the installation was straightforward, and I am very pleased. I also appreciate the easy-to-use etrailer.com website and their very fast shipment of my order.14024



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ratingratingratingratingrating by: Dave S05/08/2011

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Just wired it today with help from the video and it worked first try. So far, so good. Wiring it to the engine was the very time consuming part. But I think I found a good path using the holes in the frame and routing behind the driver side front wheelwell into the engine. Didn't take any pictures, but they are the same as what you see in the video.13096



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ratingratingratingratingrating by: STeVeN V04/08/2011

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Installation took over three hours due to finding a route for the 12 volt power lead. Patience and planning are key for that part of the install. No other problems with the rest of the procedure. Already had a trailer hitch test dongle and all functions passed ( left, right, hazard, brake; headlights on and off ). The RAV4 is ready to tow.11324



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ratingratingratingratingrating by: Ray03/09/2011

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This is the third time I have ordered from etrailer.com and each time has been an excellent experience. Determining which parts fit my vehicle is simple and the recommended accessories save time trying to figure out what fits what. Simple to follow installation instructions and now videos are great. Highly recommended.8905



- 118412

ratingratingratingratingrating by: Bill H.03/05/2011

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The shipment was received quickly. The quality of the hitch and wiring harness was excellent. However, I did have to make an adjustment to the hitch ends with a mallet; perhaps in shipping they were bent in slighly. Sill very satisified. Instructions were excellent and website is outstanding with the videos that show installation. Hitch installation took and hour and the wiring took 3 hours. Running the wire from the rear of the vehicle to the battery took the longest. I put stuck there magnet containing company info on my tool box because I will use them in the future. Prices also excellent. Bill H.8579



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ratingratingratingratingrating by: Damon C.03/05/2011

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Bought this harness for my 2011 RAV4. I am pretty good with electrical things so I did not find the install challenging. The video on the etrailer site is instructive and straightforward. It helps to have an automotive trim tool (or kit)... I like the plastic ones (available from Amazon and automotive parts stores). These are useful for removing any interior trim pieces held down with clips... in the case of the RAV4, a panel at the very back underneath the door and two on each side that must be pulled back a bit. Overall, no issues whatsoever with this harness. 8530



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ratingratingratingratingrating by: Fred P.02/11/2011

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I watched the video before installing the harness on my 2008 RAV4 and found it to be extremely helpful. Although it involved a lot of time and labor everything was exactly as shown, there were no surprises. The harness worked perfectly. I did make one change, the video said to run the power wire outside and underneath forward to the battery. I ran it inside under the trim panels on the drivers side and out through a grommet in the firewall. The hardest part was fishing the wire over the rear wheel well , a coat hanger fed from the front to the rear finally worked. Let it follow the underside of the plastic wheel well. 7049



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ratingratingratingratingrating by: John H.01/08/2011

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Great Product Very much appreciated the videos and the review comments. My 2011 RAV4 must be slightly different than the 2010 where the 1" tube was used to carry the 12v power supply (couldn't find a rear opening since it goes up into the wheel well). For extra protection I bought 20' of 3/8" wire conduit. It makes it a lot harder to run the wire, but nothing too difficult. I still need to get the correct size hex bolt so I can utilize an unused welded nut inboard of the wheel well just forward of the rear axle. I'll make a simple bracket to hold the wire so it doesn't touch the suspension at all. My shipment arrived sooner than I expected.5213



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ratingratingratingratingrating by: Larry S.12/16/2010

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Quick delivery! I received the wiring adapter the same week I ordered it. The installation was very easy, except running the hot wire to the battery. My 2011 Rav4 doesn't have much room underneath; it was difficult finding the right path from the rear to front.4201



- 118412

ratingratingratingratingrating by: Bud10/21/2010

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2010 Toyota Rav4 wire harness After watching the easy to follow video I installed the harness in about 45 minutes. Instead of an actual trim panel tool I just borrowed a two pronged meat fork from my wifes kitchen. My Rav4 already had a plastic "holster" that was padded and I just put the module in there. Shipping was fast - just three days.3530



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ratingratingratingratingrating by: Ray09/05/2010

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Great product, Great Price Product works as advertised and the price was right. The video was extremely helpful for the install on a 2010 Toyota Rav4. The challenge was following the video instructions for running the wire under the body. If I were to install it again I am sure it would take under an hour from opening the package to testing the connections. For a first time install, I would budget 2 to 3 hours.3422



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ratingratingratingratingrating by: Mike09/11/2009

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Problem w/Install Instructions The installation instructions don't indicate that there are TWO identical connectors on the passenger side that the wiring harness can plug into. Only one of them is visible when the rear panel is removed, and that is the WRONG connector. The correct connector is next to the tail light where it can't be seen! I ordered a replacement harness because I thought the first one was defective. That was the only issue, the harness works very well and all others connections were easy to make.2379



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ratingratingratingratingrating by: Willie B.08/22/2009

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Just what I needed, custom fit The instructions were right on, but I skipped removing the side trim panels and worked through the access doors. Wiring was a little short for the passenger side, maybe because I didn't remove the panels. I ran the battery cable under the car, as I had no stomach for removing all that trim. I used split tubing to protect it. Didn't like running the trailer pig tail through the door when I use it, found a "vent" from the access area to the outside and ran the wiring for the trailer and the battery through that. Install took a whole afternoon, but some time was spent rethreading the battery wire underneath as I didn't like the exposure where I first put it. I also am not electrically inclined, so I took my time and reread the instructions so I didn't fry a computer somewhere. All in all, a positive experience. Best price on the web for the system, too!!2292



- 118412

ratingratingratingratingrating by: Lonny05/16/2009

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Easy Installation I installed this on a 2008 Rav4 in about two hours. As the instructions suggested, I ran the positive line up the inside by removing the side trim from the back and front side compartments. I then ran the positive wire through the front firewall via a wiring harness access port and made the battery connection as instructed. This was an easy clean installation. Highly recomment and would buy again, if I had the need. 1854



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ratingratingratingratingrating by: Lee11/01/2007

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Easy and quick order+install Well worth it. Two day order to delivery from eTrailer. Easy wiring, idiot proof. Just plug in the connectors and attach to the battery. RAV4 Owners should note, the vehicle is the challange on this install. Its lamp wires are short, the trim is tight and you'll need to be creative running power from the battery. I zip tied it to the frame. 471



- 118412

ratingratingratingratingrating by: Rob K04/15/2014

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Good video. Easy install but it would be nice if they showed a proper route to the battery for final power hook up versus just saying" stay clear of hot or moving parts" . Come on ! A little more video would have given the public a clearer picture on this portion as to where a good route to run the wire goes.125279



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ratingratingratingratingrating by: Dave H04/08/2014

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Installing the hot wire to the battery took the longest part of the install, at least 50 percent. I routed it through the interior as others have, the hole is right where the said it was in the firewall. The rest of the harness plugged right in. Plug drops right though the hole in the quarter panel. Took about 2 hours total. Very happy with the harness, works great.124382



- 118412

ratingratingratingratingrating by: Eric S.12/02/2013

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I was very pleased with the quick response to my order. I ordered a trailer wiring harness for my vehicle in the morning. By the late afternoon I was informed that the order had been shipped that same day, and it arrived a few days later. The harness fit as promised, everything works fine. Thanks for the outstanding service.108840



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ratingratingratingratingrating by: Anthony F11/25/2013

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Everything (trailer & harness) was shipped quickly and the instructions were easy to understand. First time I've done any wiring in the car and it was simple to a point by following the instructions. The tough part is being creative with getting the positive wire from A to B. Since I chose to run the hot wire through the driver side panels inside the vehicle, initially fishing the wire can be a bit of a struggle, as well as fishing it through the grommet underneath the dash to get to get into the engine compartment. Toyota did not do us any favors(2010 RAV4) as the wire will come out in a very crowded area (look at the grommet on the passenger side to get an idea), but some creative directional fishing and patience will get you to the battery. It was helpful to keep the rear driver's side panel loose until you get the wire into the second row floor panels (personally I went from the 2nd row back). Also, as mentioned above there should be a hole available at about the 2 o clock position, after you punch through it aim to the passenger's side to help. Very doable for those not experienced thanks to the instructions.108417



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ratingratingratingratingrating by: Dale P.10/29/2013

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The wiring harness arrived a day ahead of schedule and was very easy to install. The most time consuming part was running the power wire from the battery. The instructions were great and easy to follow. The video was also helpful to watch before the installtion to become familiar with the process.105554



- 118412

ratingratingratingratingrating by: Ken D.09/23/2013

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Wiring harness was a perfect fit/install. Wires were ample length, instructions were great. It's not an EASY install since the hot lead needs to run all the way to battery, so have patience. Shipping was FAST!!101024



- 118412

ratingratingratingratingrating by: Greg H09/14/2013

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The harness is perfect. Every necessary piece is in the kit including connectors/fuse/etc....There's no way you could do this easier or faster without it, and it is cheaper than going direct through the dealer.... Even with overnight shipping! The icing is having the on line video that shows every step of the installation. Don't hesitate to purchase this product 99908



- 118412

ratingratingratingratingrating by: Rob M.08/02/2013

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So far, so good works like it is supposed to. Pretty simple install with the exception of having to run the harness power cable up to the battery from the back of the Rav. If you are lazy like me and don't feel like crawling around on the concrete with the car on jack stands, find someone with a lift and stand up while installing that wire. Much easier. Very fast shipping from etrailer.com92883



- 118412

ratingratingratingratingrating by: Bill A.06/17/2013

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The harness was very well made and the video was excellent. I was worried about pulling the trim out but it really was very smootha dn it poped back in place. The wire that you run to the battery was protected by a very thick coating of rubber. All in all an excellent product with a great video installation video.84907



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ratingratingratingratingrating by: Tyson c05/04/2013

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With the instruction video this was a pretty easy product to install. it saved me aprox $300 that the local shop would have charged. Only downfall- was no mount for the plug under the vehicle so the plug stays in my trunk and when i need it the wires hang out of the back and the door shuts on them. Although not a huge issue overall seems to be a great product!78988



- 118412

ratingratingratingratingrating by: Jeff VF05/02/2013

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This is the way to go. I really took my time after watching the etrailer video and full install took about 30 minutes. Only took 10 minutes to complete the main install with the remainder of the time spent carefully running the power line to the battery.78622



- 118412

ratingratingratingratingrating by: Jerry O04/27/2013

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This product is by far the easiest install I've ever done. Thanks to the great video, it was a snap. anyone can do this... Thanks for a great product, Jerry Owenby Asheville,NC 78096



- 118412

ratingratingratingratingrating by: Emil03/18/2013

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This is my third hitch+wiring harness combination from etrailer. The price was right, the shipping was prompt and customer service is great. The harness was complete and simple to install. The video instructions make it almost fool proof. The hard part is to route the 12v wire from the battery. I chose the under-the-car method as described in the video. Unless you are very small, plan to use a rack or as least lift the rear and then the front using ramps. Finding a good route for a wire that can carry that much current under the car is not an easy task and should be given considerable thought. I did it and I am satified, but it took a couple of hours and a lot of rolling around in the driveway to get a route that I liked. I wish there was also a video showing how to route it through the body interior. 71508


Comments

After a year, I am completely satisfied. It is plug

comment by: Emil - 3/17/2014


3150



- 118412

ratingratingratingratingrating by: Randy M03/13/2013

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Wiring harness was complete with all needed wiring and connectors and works properly after installation. There is a slight error in the installation video, so I had to determine a path for routing the power wire, but otherwise excellent.70441



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ratingratingratingratingrating by: Jim P02/18/2013

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Between the online video, and the printed instructions this was very easy to install. Thanks for the zip ties as well to help tie the battery wire down. Only change I would make is for the hot wire to be red. 66867



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ratingratingratingratingrating by: Patriot Scott09/04/2012

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The wiring harness itself was great. The "hook up" was a little bit of a problem only because you couldn't really see the light plug in connectors, and had to go by feel. The available video was a real life saver though. Two thumbs up for etrailer.com!53843



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ratingratingratingratingrating by: Bob M07/23/2012

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Works awesome, Pay attention to the video and watch the video all the way through!!!. Have confidence in your own ability to do this. Hardest Part was unhooking the connections at the back lights and reconnecting them, patience and watch the video again and again.48925



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ratingratingratingratingrating by: Robert Y06/27/2012

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Great harness, better deal than OEM. Very easy to intall, the video was very helpful. In the video, instead of running the connector out through and closing the gate on it, there is a hole at the bottom with a rubber grommet that the connector can go through.45851



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ratingratingratingratingrating by: Chuck06/25/2012

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The kit was fairly easy to install. The most difficult portion was getting the 12v power through the firewall to the battery. We had some issues getting the trim popped out of the back of the Rav4, and never fully got the side panels removed, but we got them out enough to get in there and work. The wiring is definitely long enough to stretch across the back of the car, and there was no splicing/lengthening needed to attach to the tail lights. All in all, it was a 2.5 hour job, not the one hour quoted in the instructions, but I'm happy to have the trailer wiring installed. A good DIY project that doesn't require paying a professional. 45661



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ratingratingratingratingrating by: chb06/11/2012

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The wiring harness was as advertised, the video was very helpful. Would have been so much easier if you didn't have to run a power lead to the battery but that is toyota crappy wiring-the wiring kit from e-trailer is complete and provided everything you need to do the job.43636



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ratingratingratingratingrating by: Johnny J06/02/2012

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The video made installation real easy. The only difficult part was getting the power wire from the front to the back of the car, Ran it inside of the car instead of underneath. Toyota didn't make it easy to get from the inside of the car to the engine. Cost of product was a third of what the dealer quoted without installation.42492



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ratingratingratingratingrating by: KJ05/07/2012

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Easy install especially with etrailer videos. Running the power wire to battery proved difficult. Not a lot of areas to run wire under 2006 Rav 4. Will need to use a lot of wire ties. Overall very pleased. The kit includeds everything you need including a self taping screw for ground wire. 39616



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ratingratingratingratingrating by: MattyB04/28/2012

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Easy install. I would recommend running power wire from battery to trunk under vehicle (plenty of room on Rav4). Product fit great and works every time! I would not recommend pinching wiring b/t trunk as instructions recommend. Factory rectangular rubber grommet under rear bumper allows OEM looking install.38708



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ratingratingratingratingrating by: Gerry J04/01/2012

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This was my first time using etrailer and I was impressed. The product was as described and fit perfectly. Shipping was quick and I appreceiated the email updates. The online installation video was a great compliment to the written instructions. Very pleased!35832



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ratingratingratingratingrating by: Schofield03/13/2012

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So nice to have the T-connectors; they made the wiring installation so much smoother. Fit my 2012 RAV4 perfectly. I wish they would devise a better way of connecting to the positive wiring. A clean and simple installation turns into a mess when the positive wire has to be routed over/under/around/through things to get to the positive battery terminal. On newer vehicles that is nearly impossible. Otherwise I would have rated it excellent. Took me two hours to install.33753



- 118412

ratingratingratingratingrating by: Acer1003/08/2012

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After watching the installation video at etrailer.com,I installed the T-One Wiring Harness{118412} in my 2010 Toyota Rav4.The installation does take a little time,but all the parts you need are included.I think the hardest part of the job was running the wire up to the battery.If you had a lift accessible,it would be much easier.I give the product a thumbs up.33289



- 118412

ratingratingratingratingrating by: Matt M.02/29/2012

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The kit was fairly straight-forward. The T-connectors fit beautifully onto the existing plugs. The hardest parts were getting the trim open, and fishing the wires. The positive lead had to go to the battery, so it had to be fished up front and through the firewall. The drivers side had a rubber grommet with a thick bundle of wire and the hood release cable passing through it. I noticed what appeared to be a hole on one side of the grommet. I used my inspection camera to see that I could easily punch through this hole with an awl. After the hole was punched, I lubricted the wire and it pushed through easily. After the connection was made, I put my tester on and everthing worked fine.32795



- 118412

ratingratingratingratingrating by: Donald A01/28/2012

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Top quality hitch, excellent workmanship. The fitment was perfect. The video I highly recommend watching for installation. I purchased the complete hitch package for my suv and the videos were to the point with step by step simple instructions for installation. 30490



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ratingratingratingratingrating by: shawn s.12/25/2011

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Product was easy to install, came with all necessary hardware and wires had enough slack to route nicely. I didn't follow the directions exactly, and ended up routing my cable without having to remove any trip panels. It took about 25 minutes to install this kit completely, including zip-ties to secure the power lead. I was so very happy to not have to remove any trim panels, just routing the cables under the plastic in the storage area, near the back bumper. The plastic was flexible and just allowed me to slide the cabling between it and the carpeting. I took a bit of time and just felt the wiring as it lead back into the taillight assemblies, and disconnected it from the taillight by pressing down on a locking tab in the top of the wiring assembly. It would have been easier if toyota made it easier to see up into the assembly, but following the wires with my fingers was easy enough. My only suggestion would be to the company to increase the length of the wire going to the right tail-light connectors, this would have made routing the wires without removing any trim panels even easier. If that were the case, I am sure I could have done this in about 15 minutes. 28714



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ratingratingratingratingrating by: Joe S11/21/2011

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This is a very good product and along with the videos on the website, getting the harness hooked up was pretty easy. The toughest part was getting the power lead from the back to the battery. Overall, great price, great product, very usefull videos.27214



- 118412

ratingratingratingratingrating by: Tom S09/25/2011

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I have ordered two items in the last couple weeks. Finding my desired products was as easier than any other web site I have used. The product hitch and wiring harness were received within 3 days each. The online instructions were clear and complete which made the installation quick and easy. Keep up the great work and I will be back.24558



- 118412

ratingratingratingratingrating by: Carlos R09/17/2011

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I got behind on getting on the road by two days because I had gotten into refurbishing a 4X4 "Cube" trailer with luggage rack to eliminate the congestion in the car for our long trip. Ups arrived with the hitch and the wiring harness I was very glad but when I unpacked the harness I knew I would take it in to a elec. shop for install and that was only because of time restraints. The level of skill required to instal it is a little tricky because of the panels "snap and fit". I would give my self a long time to do this. I am very pleased with everything from the time I ordered it till the UPS guys dropped it off. But its not just pull and plug.24144



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ratingratingratingratingrating by: Midland9807/12/2011

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The installation was fairly easy after watching the video. The only part I didn't care for was the need to run a power wire to the battery but aside from that it really is nice. I like the idea of keeping the wiring in the side access panel until needed.19327



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ratingratingratingratingrating by: Frommy05/12/2011

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The connectors which tie into the lighting work, which is better than a competitor's product, which had the wrong plugs. However, the wiring that runs from side to side of the RAV is too short. I had to splice in some pieces on my own to get it to work.13647



- 118412

ratingratingratingratingrating by: Tom Lea04/13/2011

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Quality looks fine. VERY rapid delivery and I love the install video on their WEB site. BUT: it's most likely going to take you a couple of hours to get this job done. I also didn't like the idea of running the flat-4 connector thru the door, so I ran it outside permanently. Still, a good value for the $$$.11634



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ratingratingratingratingrating by: Ron06/18/2010

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Great product poor directions I purchased this product in Sept. of 07 but had not installed it until recently as I hadn't needed it. The only problem with the installation was the 2 similar connections on the passenger side which were not noted in the instructions. My Rav4 is an 07 and it still had the 2 connectors one of which wasn't visible. Fortunately I found a review on the internet which described the problem I was having. My only suggestion is that the installation instructions could be more complete. More pictures and description of the trim removal process, wiring etc. would be helpful.3144



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ratingratingratingratingrating by: Gary D.06/03/2013

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Bought this kit 4 years ago for my rav4 back in 2009. I don't use my trailer more than 5 times a year and one side will not operate brake or directional light. Troubleshooting revealed power going to modulelite box (black box included in kit) but not coming out to trailer. Unfortunately the only fix is to replace entire kit83050

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Ask the Experts about this Tow Ready Custom Fit Vehicle Wiring
Expert Answers about T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118412                                            Do you have a question about this Custom Fit Vehicle Wiring?


  • Running a Power Wire on a 2009 Toyota RAV4
  • You should not run the power wire from the T-One Vehicle Wiring Harness, item # 118412, to the 12V at the back of your vehicle instead of running the hot lead to the battery on your 2009 Toyota Rav 4. You need to isolate the trailer wiring from the vehicles sensitive circuitry. Tapping into the vehicle 12 volt supply at the back of your vehicle will put your vehicles wiring at risk. You also need to be sure and install the included in-line fuse holder and fuse to protect the converter.
    view full answer...

  • Vehicle Wiring Harness, Part # 118412 for a 2008 Toyota Rav4
  • Your experience is typical of the dealer mark-up on parts. The T-one connectors we offer are engineered specifically for each vehicle, there is no functional difference. The Vehicle Wiring Harness, part # 118412 is custom-made for your 2008 Rav4.
    view full answer...

  • Wiring Harness Installation on a 2008 Toyota RAV4
  • We do have a video installation of the Tow Ready Custom Fit Vehicle Wiring, # 118412, see link. This installation is on a 2009 RAV4 but should be very similar on your 2008 model. I have also included a link to the installation instructions for you to review.
    view full answer...

  • Wiring Harness Not Powerful Enough to be Used with a Trailer that Needs More Amps
  • The maximum amp rating for the T-One Wiring Harness are as follows: Maximum stop/turn light: 1 per side (2.1 amps), Max. tail lights: (4.2 amps). This rating is even with the hot lead pulling power directly from the battery. For your application, you will need to use a Heavy Duty Modulite, part # 119190KIT, which is rated for 15.9 amps. This kit does not plug directly into the vehicle, so it must be hardwired. The Kit includes 20 feet of 12 gauge wire for attachment to the battery.
    view full answer...

  • Running Power and Ground Wires on a 2009 Toyota Rav4
  • Wiring the power wire on the T-One Vehicle Wiring Harness with 4 Pole Trailer Connector, # 118412, should not be all that daunting. It just takes a little patience and when you are complete you will be glad you have the protection for the circuitry in your vehicle. Either route the black wire through a grommet and along the exterior frame or follow the existing wiring along the thresholds into the engine compartment, up to the battery, avoiding areas that may pinch or break the wire. You s
    view full answer...

  • Should Right Turn and Brake Functions be Located on the Same Wire on T-One Wiring Harness 118412
  • It is the industry standard for the right turn and brake functions to be powered on the green wire on the 4-Way plug, and for the left turn and brake functions to be powered on the yellow wire on the plug. So in short, yes, your right turn and brake signals should be functioning on the same wire. Are you actually having problems with lights not working when you connect your vehicle to your trailer? If you are, please let me know what is happening and I would be glad to help you find a solut
    view full answer...

  • Can I Tap Into Any 12V Power Source at the Rear of a Toyota RAV4 for Tow Harness Part 118412
  • The location that Tow Ready, manufacturer of the harness, and the location that we recommend is the positive battery post. There is not any wiring, readily accessible, in the rear of the RAV4 that can handle the amperage that is drawn through the power wire. Connecting the power wire to any power circuit in the rear of the vehicle can potentially result in a wire being over drawn and damaging the vehicle. Included in the kit is a length of wire to run that power wire up to the engine bay and
    view full answer...

  • Does T-One Vehicle Wiring Harness # 118412 Require Direct Connection to battery on 2010 Toyota RAV4
  • The wiring in the power port may not be rated for this type of application. The harness should not be used unless you attach the power wire to the battery via the in line fuse and fuse holder included with the kit. This will protect the sensitive wiring and electrical components in your RAV4. Also, the T-One Vehicle Wiring Harness, # 118412, requires a direct connection to the battery on your 2010 Toyota RAV4 because should there be a failure or malfunction in the electrical system, the harne
    view full answer...

  • Troubleshooting Green Right Turn and Brake Wire Stays Hot all the Time on 2009 Toyota RAV4
  • On your 2009 Toyota RAV4, there is more than 1 connection point that the T-One Vehicle Wiring Harness, # 118412, could plug in to. The connections are behind the trim panels on each side. You will need the connectors that are closest to the taillights. I have included a link to the installation details as well as an install video showing installation on a 2008 model. If you still have a problem, you can test the wires going into the converter box on the harness. If all functions are corre
    view full answer...

  • Routing Modulite Power Wire to Engine Compartment 2010 Toyota Rav4
  • The sub frame tube is located just forward of the rear suspension. The tube is approximately one inch in diameter. I have asked the installer that appeared in the video if he could recall how far up toward the front of the vehicle the tube extended, but he could not recall. There is no one correct method of running that wire to the engine compartment, as long as the wire is kept away from any moving parts such as suspension components and anything hot, like the muffler, exhaust and exhaust
    view full answer...

  • Troubleshooting Modulite Installed on on 2008 Toyota Rav4
  • Modulites can occasionally short out. I would recommend using a circuit tester like part # 3808 to test the wires going into the converter box. Test only the wires that go to the tail light assemblies, not the red wire that runs to the battery. If you show no power going into the converter box from the tail lights, then something in the converter box has shorted out and the harness will need to be replaced. If you determine that the converter has shorted out and needs to be replaced, I would
    view full answer...

  • Length of Battery Connection Wiring in T-One Trailer Wiring Harness # 118412, 2010 Toyota RAV4
  • The wire that connects to the battery in the T-One Vehicle Wiring Harness with 4 Pole Trailer Connector, # 118412, is actually 12 gauge wire. The kit comes with 20 feet of wire to reach from the rear of the vehicle to the front of the vehicle. I have included a link to the installation details for this wiring harness along with a link to a video showing a typical installation on a similar vehicle.
    view full answer...

  • Troubleshooting Battery Drain on 2011 Toyota RAV4 with Tow Ready Wiring Harness # 118412 Installed
  • If everything is wired up correctly this Tow Ready Custom Fit Vehicle Wiring, part # 118412, should not be drawing any power unless the key is on or an accessory is attached that would draw power. The only way this unit could drain your battery is if maybe there was a short on the power circuit that was causing the battery to get drained. I would go over all of the connections of this unit and look for corrosion or loose wires. As long as this thing is wired correctly there should be no d
    view full answer...

  • T-One Trailer Wiring Harness Installation on a 2011 Toyota RAV4
  • Yes, installation of the T-One Wiring Harness, item # 118412, will be essentially the same on the 2011 RAV4 as it is on the earlier year models like the ones in our videos, and in the instructions, see links. The only difference may be accessing the rear of the tail lights, for connection of the wiring harness. Since the vehicle design has changed a bit, the interior panels may have changed some and removing them may be slightly different. We have not had the opportunity to install wiring on
    view full answer...

  • Can the 4 Prong Trailer Connector be Mounted Outside the 2011 Toyota RAV4 Instead of in Cargo Area
  • Yes, you can route the 4-Way trailer connector out through a grommet in the rear of the vehicle or through a vent, found in the access area, to the outside and run the wiring for the trailer and the battery through that. Once the wiring is routed outside the vehicle you can use the 4-Pole Flat Mounting Bracket, item # 18144, and a No-Drill Mount Bracket, item # 18140, to mount the connector on the hitch.
    view full answer...

  • How to Charge a Camper Battery with a 6-Way Connector on Pop-Up Camper and a 4-Way on Tow Vehicle
  • I would recommend to use the Hopkins 4-Way to 7-Way and 4-Way Adapter, part # 37185. This adapter will install on your 2011 Toyota RAV4 and allow you to have a 7-Way connector and also a 4-Way connector. You would plug in the 4-Way on your vehicle to the back of this adapter. There will be four remaining wires on the back of the adapter. The white ground wire will need to be attached to the vehicles frame. The black wire on the adapter will need to be connected to the vehicles positive batte
    view full answer...

  • Trailer Lights Not Working After Installing Trailer Wiring Harness # 118412 on a 2009 Toyota RAV4
  • The first thing I would check is the fuse that came with the Tow Ready Custom Fit Vehicle Wiring, # 118412. If it is not inserted all of the way or is blown, the converter will not work. Make sure the power wire for the converter is attached to the positive battery terminal via the in line fuse holder and fuse. No other 12 volt connection should be used. Make sure the white ground wire is attached to a bare metal surface. On the 2009 Toyota RAV4, there are 2 sets of connectors behind the tail
    view full answer...

  • Troubleshooting a T-One Vehicle Wiring Harness # 118412 Installed on a 2010 Rav 4
  • The first thing to check is always the ground wire, if the ground is bad you can see all sorts of strange behaviors on the trailer lights. You will also want to check the grounds on the trailer wiring also just to rule out the trailer causing the problems. The best way to test the box would be to get a circuit tester like the part # 3808 and test the wires going into the box and then out the other side. I would start on the left blinker signal wire on the input side of the box. You will
    view full answer...

  • How To Connect 2010 Toyota RAV 4 to Trailer With 5-way and Separate Turn and Brake Signals
  • What you will need to do is use the Vehicle to Vehicle Taillight Converter, part # 118158, and 4-Pole Trailer End Connector, part # 18004. To install, you will mount the # 118158 converter on your trailer. You will cut your 5-way connector off and connect the Yellow and Green wires of the converter to the new # 18004 4-way. The white wire will be grounded to the trailer frame and the White wire on the 4-way will also be grounded. The Brown wire will by-pass the converter and connect to the br
    view full answer...

  • Troubleshooting a Tow Ready Wiring Harness on a 2011 Toyota RAV4 Limited
  • It sounds like there is a ground issue on the trailer. Typically, when there is erratic tail light behavior it is because something is not grounded correctly on the trailer. Especially since the guys at the trailer rental place tested the 4-way and said it was working correctly. To rule this out you could try hooking the 4-way of your 2011 Toyota RAV4 to a different trailer and see if the problem persists. If the problem goes away you know that it was the trailer and the Tow Ready Custom Fit
    view full answer...


Toyota RAV4 Accessories


Info for this part was:


Test Fit:
Joe V

Expert Research:
Michael L

Video Edited:
Zack K

Expert Research:
Sarah L

Video Edited:
Andrew K

Expert Research:
Robert G

Expert Research:
Patrick B

Expert Research:
Michael H

Expert Research:
Jeff D

Expert Research:
Reno H

Expert Research:
Jameson C

Video Edited:
Joshua S

Test Fit:
Rick A

Video Edited:
Mike H

Photos by:
Jim W

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