Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Rating: 
55 reviews
Code: 118412
Retail:$67.80
Price:$49.95
Shipping Weight: 2 pounds
Shipping Special
Tow Ready T-One Vehicle Wiring Harness by Draw-Tite, Hidden Hitch and Reese
Can be used with 5-pole, 6-pole or 7-pole adapters.
Installation: Connection points are located behind the trim panels on both the driver and passenger sides. On 2008 and newer models, there are two sets of connectors. Connect the t-one harness to those that are closer to the vehicle taillights. On all models, the power wire that is run to the vehicle battery can either be done by routing the wire through a grommet underneath the vehicle, or by following the existing wires along the inside of the vehicle behind the trim panels. The 4-pole trailer connector will be stowed in the side storage compartment on the driver's side.
Tech Tip: It is always a good idea to apply a small amount of grease to all electrical connections to help prevent corrosion.
Video of T-One Vehicle Wiring Harness with 4 Pole Trailer Connector
Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
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.
2006 - 2012 Toyota RAV4
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Average Customer Rating: 4.8 out of 5 stars (55 Customer Reviews)
by: Steve L.05/05/2011
Is this review helpful?
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
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
by: stew z.06/27/2011
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fast shipping, easy to assemble, I 100% recommend18004
by: Jim J06/24/2011
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Installation was a snap. The Utube video was a big help.17810
by: Tony05/31/2011
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Great product easy to install just few hours.15802
by: Paul M.05/30/2011
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Easy install.Just the way the video sho wed.15725
by: Tom E.05/15/2011
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It works great. Just a little difficult running a wire all the way to the battery14097
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
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
by: Mitch05/11/2011
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Easy to follow direct. Very Please with the kit.13563
by: Frank P.05/11/2011
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Good price/easy to install/very happy with product and service13423
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
by: Norm S.04/28/2011
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Delivery was quick. Instructions online were helpful. Definitely a quality product and relatively easy installation.12551
by: john f04/20/2011
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easy, compaired to other kits that had to be spliced (ugh).. the installation video was great and a big help12088
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
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
by: Dan Aubuchon03/14/2011
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excellent shipping 9326
by: Charlie E03/11/2011
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Viewed the video instructions before hitch and wiring harness were delivered. Installed hitch and did the wiring without problems. Everything worked great.9067
by: Michael T.03/10/2011
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Very easy to install, only took about 30 minutes. Etrailer.com also shipped item very quickly.9038
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
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
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
by: Anthony R.02/24/2011
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I have not installed this yet, but if the info on etrailer.com and previous experience are any indication, I should not have any trouble.7764
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
by: Brad T.01/24/2011
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Great instruction video. I followed it and had no problems5983
by: Ken S01/14/2011
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Hitch wiring Everything went perfect. Very customer oriented organization. I would reuse this E-Trailor again without hesitation. 5472
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
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
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
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
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
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
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
by: SurveySays07/14/2009
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What Toyota needs. This is what Toyota should have installed when you order the Tow Package. I think they've corrected this now.2129
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
by: Alex05/02/2008
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Must have wiring kit I agree with everything that LEE just mentioned. I ran the power cable to the battery from the inside of the car via plastic shield by the door frame on the floor.814
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
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
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
by: Ljc12/05/2011
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Everything needed to get it done. Instructions were good but they could have had more pictures. But overall it was actually a pretty easy install. 27753
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
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
by: John10/08/2011
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I purchased this trailer light system for my 2008 Toyota RAV4 and found that it was easy to install and worked just like it should. No complaints.25283
by: jc10/05/2011
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Easy to install, works like a champ!! 25125
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
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
by: thomas09/02/2011
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everything was what i order your video help a plus thanks23512
by: Roy J.08/31/2011
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plug and play 23306
by: Doc08/11/2011
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Great Company! fast shipping, good pro duct!21589
by: chuck08/03/2011
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I ordered the kit on Sunday afternoon by Sunday night they indicated it had shipped and I had it by Tuesday afternoon. The kit went in real easy the only tough part was getting to the front of the car. 21051
by: Randy07/31/2011
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Great product. Delivery was prompt, only 2 days. easy to install following online installation video at etrailer.com. Works great!20636
by: Mike G07/21/2011
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FAST SHIPPING, GREAT PRICE and GREAT INSTRUCTIONS! HIGHLY RECOMMEND!!!!!!!!!!!!!!!!!!!!19821
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
by: David D.07/12/2011
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Everything came on time and in great shape. Hitch fit was great. Easy installation.19226
by: don wigal07/08/2011
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excellent service - best from any online product i have purchased from other companies thanks keep up the excellent work18940
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