T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
(362 reviews)
Price: $32.69
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
Item # 118304
Retail:$68.39
Our Price: $32.69
You Save: 52%
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- All Info
- Reviews (362)
- Q & A (0)
- Photos
Tekonsha Custom Fit Vehicle Wiring - 118304
- Custom Fit
- Trailer Hitch Wiring
- 4 Flat
- Converter
- Tekonsha
Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Includes tail light converter.
Features:
- Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
- Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
- Connects quickly and easily - no cutting or splicing of wires
- Locate connection points behind tail lights
- Plug in T-connector
- Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
- 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 vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness.
Once installation is complete, the 4-way flat connector will be stowed in the jack storage compartment of your rear 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.
Tail Light Converter
A tail light converter 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 vehicle's three-wire system need to be combined so they are compatible with the wiring system of your trailer. The tail light converter combines 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 vehicle operate.
118304 Tow Ready T-1 T-Connector - 4 Wire
Installation Details
This Product Fits The Following Vehicles
- 2004 - 2010 Toyota Sienna
- 2004 - 2010 Toyota Sienna
California residents: click here
Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
- Wrong item was ordered
- Did not fit
- Product did not meet expectations
Customer Reviews
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118304
Average Customer Rating: 4.9 out of 5 stars (362 Customer Reviews)
Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Includes tail light converter.by: Kent 03/13/2023
Worked very well - much better than the last kit I used that required cutting, stripping and splicing. Plug and Play is the way to go.
by: Steve06/01/2023
Super easy to install, all wires sufficiently long, good instructions, 20 min install, works properly.
by: Steve 10/23/2023
The harness worked great although I had to cut the cable to allow it to go through the grommet from inside to outside. I would be great if your manufacturer could slide on a grommet before attaching the connector.
by: Drew01/15/2024
Outstanding parts knowledge and a high quality products!
by: Ted 07/15/2022
This harness was easy to install and solved an issue that I could not diagnose with my old harness.
Ted
7/17/2023
Still good, I would re-order from etrailer
by: Michael 08/08/2023
2007 Toyota Sienna
I found the wiring harness fairly easy to install. The video for my make & model helped a lot.
by: Seth H.01/28/2013
2008 Toyota Sienna
Perfect fit. Online install demo was great, but there is a better way to route the trailer plug to the outside for a more permanent, and out of the way, factory install kind of look .
by: Ed07/14/2023
It was easy to install using the provided instructions, and it seems to works as expected.
by: Mid USA07/14/2022
Easy to install and has lasted well. Not big on the loose wire just hanging out but I understand there aren't many options.
Mid U.
7/18/2023
Continues to work well. No issues with this wire harness
by: Tim05/28/2021
Fits perfect. Allways retorque your mounting bolts after the first real tow. All but one of mine were good!
by: Todd C.07/25/2017
2004 Toyota Sienna
I bought a hitch, stinger, ball and wiring harness for my 2004 Toyota Sienna. It was delivered fast, it was the right stuff, and it fit, just like it was supposed to. It really was as easy to install as it looked in your video. The video was immensely helpful too. The video showed me exactly what I needed to know to get my hitch installed correctly and it gave me the confidence to order online and do it myself. The only drawback is a loss of ground clearance but you warned me fair and square up front about that, so I can hardly complain. Thank you, that was a good investment.
Todd C.
8/5/2018
Still working flawlessly.
by: Lou.07/16/2014
2007 Toyota Sienna
Kit came with good instructions and pictures of the installation of the specific car itself, not just some generic pictures. Length of the wires are generous and allowed some flexibility of routing and location of the unit. The plugs snaps solidly into their respective places. Everything works like it should before the car panels and tail lights were put back into their places. Great product! Along with the Curt hitch bar, now my 07 Sienna is ready to tow a boat.
Lou.
7/16/2015
Been a year with lots of use, launching boat in both fresh and saltwater and the wiring is working great!
by: James02/20/2022
2015 Toyota Sienna
2008 Toyota Sienna LE 8 passenger, FWD, stock.
Hitch, perfect fit! Wiring harness, perfect length. Time, about 2 beers on an empty stomach.
Tools: you will need a metric socket set.
10mm to remove the rear plastic cover in the trunk (for the wiring harness kit installation), 19mm to install the bolts that secure the hitch to the van. Follow the instructions or [online] it... one can do it... but two is always better than one... unless you two don't get along, then go at it alone...
You may/will also need a drill, heavy duty sheers or hacksaw. Some sort of liquid rust fighter, a pry-bar, various chunks of wood.
Basically, I bought 4 HDX 1/2" fitting brushes from [online] for $x.xx a piece, nipped the handles off, and put them in the drill. Going in the forward direction only (if you set the drill in reverse in an attempt to back out the brush it will literally unwind and come apart), I sprayed rust breaker on the brush and used them to clean out the holes for the bolts. The bolts are metric and a fine thread (meaning the grooves are more shallow than coarse threads, there are more groves, and they take more to clean out, coarse seems to be more forgiving when rusted.).
I used all four brushes to clean out the six holes. As my vehicle was bought used, it had no plastic rear cover so the threads where corroded. The pry-bar and wooden blocks where to hold the exhaust tube out of the way (pry the bar to the side, use the blocks to hold it.
Once the threads are cleaned out, it's a snap. It would be a good idea to put a little anti-corrosion on each bolt before installing (good habit to have.)
Installed the wire harness kit from etrailer. Loved it, would recommend getting some wire protector sleeves and sliding this over the wires for longevity protection. This would prevent the vibrations from driving down the road from wearing through the wires insulation and causing a potential/eventual short circuit...(etrailer.... why don't you offer a protection kit for a few bucks more.... one stop shop hint hint.... I'd pay extra for the convenience and also if it came with more zipties...zip ties.... a lot more zipties..)
Final thoughts: it is my intention to do the following... if you [online] "Michael Byrne air loft review" he has a 2015 dodge grand caravan I would copy.
Install ceramic rated rotors, and ceramic brakes for heavier hauling.
Install air lift helper springs from etrailer... would love to get the compressor kit, but cannot justify the cost of convenience... according to Michael Bryne, the included air hose didn't like the cold and flexing and failed... (so if you live in the cold ranges, due dilligence is probably a good idea).... Thus the airbags collapsed and pinched and tore the bags. He recommends upgrading the air hose to a braided line. I think I will do this, and route it into the van to a T-fitting. Then use the included line to run up to the driver seat before putting in another T-fitting in.. one side will supply a pressure guage that I can see as I drive daily and monitor for low pressure... the other will go the fill nipple located nearbye... That way I can use an air compressor that I already have that runs off of the cigarette port to fill it, and see my pressure from the same spot, that I monitor... (Why etrailer doesn't offer an add on kit of more hose, fittings, and a pressure Guage with a mount kits is beyond me... hint hint... take the idea etrailer... ask $XX extra bucks, one stop shop, and its a heck-of-a better bargain than a $XXX basic compressor kit.... some of us dont need fancy, we need practical)....
I also plan on upgrading the suspension to a beefier, stiffer suspension, as the van tends to be a little soft when loaded down. I put in Monroe load adjusting shocks and KYB quick struts and looooooved them when I had my grand caravan... also had put on 4 all weather tires that roooocked in the snow from tires plus... they where quiet...
I know, I know, why not get a suburban? Sliding doors, that's why, sliding doors = no door dings caused by my children.... it's lower to the ground so my little ones can get in without the risk of falling and cracking their heads on pavement... that and the 24mpg... and it's paid for... and it's a toyota.... plus.... who wants to steal a minivan...
Jenny N.
2/25/2022
You brought up several good points in regard to the hitch and the harness. We recommend cleaning out the bolt holes thoroughly before beginning he installation. While we do not have a ready made kit we do have wire loom, part # 7509-10, and zip ties part # DW05727-10 available. The idea of a hose kit with a gauge is a good one.
Helpful Links
by: Evan11/07/2017
Curt receiver was a perfect fit. Wiring harness also fit well. Both are quality products. On-line instructions and videos were spot on! Parts arrived earlier than expected, which is always a plus. Customer follow up was also an unexpected surprise. Customer reviews and installation videos were also a great help. Would definitely purchase from this vendor again!
Evan C.
11/10/2018
Still working great after a year of moderate use.
by: KM05/12/2014
2008 Toyota Sienna
R TRAILER service is great. This is the 3rd item I've ordered from then, they always deliver great products quickly & at a great price. The install videos help tremendously. This light kit installed very easily.
Km
5/18/2015
It still works well!
by: KM05/12/2014
2008 Toyota Sienna
R TRAILER service is great. This is the 3rd item I've ordered from then, they always deliver great products quickly & at a great price. The install videos help tremendously. This light kit installed very easily.
Km
5/18/2015
It still works well!
by: bill b04/25/2017
2010 Toyota Sienna
The hitch is well engineered and fabricated. I had minor problem during installation. The hitch did not slip right in but rather requird a bit of adjustment to spring out theright arm. The wirin harness was perfect.
Bill B.
4/25/2018
The harness and hitch work great. I am glad I bought that package.
by: Bruce D07/02/2014
Bought this wiring harness and it is awesome. Makes wiring so simple!! I definitiely recommned etrailer.com ! Fast shipping. quality products.
Bruce D.
7/7/2015
The product continues to work awesome.
by: Chris04/01/2022
I wish I could recommend this product, however after using it just a couple of times, it stopped working and I had to pull my trailer at night with no lights at all. I’m not quite sure what to do with this point.
Heather A.
4/8/2022
The most common reason for the wiring harness to stop working is the ground. You want to make sure the ground has a clean connection to a bare metal surface. The other common issue is the converter box is defective. You can test it pretty easily with a circuit tester like part # PTW2993 by testing for voltage on the input side of the box when the taillight circuits are applied and then testing the output side as well. If voltage is making it to the box but then not to the other side the issue is internal of the converter and it would need to be replaced.
by: Nathan06/07/2022
Fast shipping, perfect fit and has functioned well over the last year. It really gave us a lot more adventuring options as a family with a van. The only thing to watch for is if you are installing this on an older vehicle with a pre-drilled/threaded frame for a hitch is that you may need to run a tap through it to clean out the corrosion out of the threads. A small economic investment that really added a lot to our vehicles capabilities.
by: Paul V.07/01/2014
2004 Toyota Sienna
I got this kit for a 2004 Toyota Sienna. This kit is way simpler and faster to install then the other cut n' splice kits out there, and probably a lot more reliable and trouble free. Installation was easy, once I read the instructions and watched the online video (really helpful and highly recommended). Two words of caution: 1.) Take your time wiggling the "wrap-around" portion of the taillight assemblies off of their two keeper studs. I was fearful of breaking a tail light assembly and the $ involved in replacing one. I Actually used a wood paint mixing stick to help wedge them out. Worked great. 2.) Zip ties are your friends. Use them to keep the harness up and out of the way of the jack and handle mounted to the compartment door.
The guys at E-trailer kept me updated as to where the shipment was. In retrospect I would have paid a little more and chosen a faster shipping method.
Bottom line is the trailer lights work great, the kit assembly quality is top notch, and the install was very smooth and easy.
I will be buying from E-trailer again.
by: Rick M05/10/2011
There was no way I was going to splice into my light wiring using a generic trailer lighting kit once I saw how tightly it was wired. Spotted this on the internet and watched the video(very helpful). Cost a bit more but couldn't have been any simpler or quicker to do. Unplug the harness from the lights and plug it into this harness and then this harness to your lights. Only screw up was not being careful enough removing one of the taillights and I broke it so had to get a new tail light.
by: Louis 01/14/2023
Well made. Fairly simple to install with some help. Fits great. Harness also seems well made and simple to install. All working well. Be sure to torque bolts properly!
by: Jose04/10/2018
2004 Toyota Sienna
I would give it a 5, but I don't particularly like the fact that it is designed to leave the wire in the jack storage compartment, and then dangle it out the back hatch when you want to use it. There should be an alternative installation procedure that allows you to cleanly install it through the bottom and permanently attach it to the hitch. Other than that everything fit perfectly and it works like a charm.
Heather A.
4/11/2018
Jose, thank you for your review. If you would like to route the 4 way connector under the vehicle for a cleaner look you will need to find a grommet hole in the cargo area. If the grommet hole is not large enough or you cannot find a hole in the cargo area you will have to drill a hole large enough for the 4 way connector to go through. Be extra careful not to drill through anything on the underside of the cargo area. Once the hole is drilled then seal up the hole so moisture and fumes cannot get inside of the vehicle. Once you have routed the 4 way connector underneath the vehicle then you will need to mount it to the hitch using a brack such as part # 18144. This mounting bracket will require drilling. For a no drill option use part # 18140 with the bracket.
by: Jason09/09/2013
Product was exactly what was promised. Had adhesive on back of black box to attach inside jack storage area. With the accurate and easy to follow installation video it was done in 30 minutes or less and saved about $400 if had dealer provide part and install.
Jason
9/10/2014
Working great with no regrets.Thanks again!
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Show More Reviews
See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring
- Troubleshooting Trailer Wiring Harness that Stopped Working Totally After Blown FuseIt sounds like you may have damaged the converter box of the part # 118304 when you blew the fuse and now it's not functioning properly. What you can do is test for voltage going into the converter box and then test for voltage on the output side to see if the voltage is in the correct places. If voltage going in looks good but not coming out then the box is bad. Before you replace it you will want to inspect the wiring of your trailer to see if you can find anything that would cause...
view full answer... - Will Trailer Wiring Harness 118304 Work with LED Trailer Lights and a 2004 Toyota SiennaYou should have no problems using wiring harness # 118304 on your 2004 Toyota Sienna to tow a trailer with LED lights. With this harness, the vehicle wiring powers the trailer lights. LED lights have little draw compared to incandescent lights so they will not overload the system and the lights should work great. I have included links to the installation instructions and a video showing a typical installation for you.
view full answer... - Does T-One Vehicle Wiring Harness 118304 for a 2008 Toyota Sienna Connect to the BatteryThe T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Item # 118304 does not require a connection to the battery on your 2008 Toyota Sienna. It just plugs in line with the vehicle tail light wiring and gets grounded to a bare metal surface. I have linked a video showing an example installation for you.
view full answer... - Trailer Wiring Harness Recommendation for a 2007 Toyota SiennaWe sell trailer wiring harnesses for your 2007 Toyota Sienna, but we do not carry any converter boxes that we could recommend to replace the factory Toyota converter box. For trailer wiring you would want the part # 118304. I also attached a video that shows how to test a converter box for you to check out before you but a new harness.
view full answer... - Trailer Wiring Harness for a 2006 Toyota SiennaFor your 2006 Toyota Sienna there is a plug and play wiring harness available, # 118304. This harness will fit, and just plugs in line with the vehicle tail light wiring. There is no splicing into the vehicle tail light wiring required.
view full answer... - How is Trailer Wiring Connector Used with Trailer if it is Stored in Rear HatchA trailer wiring harness like # 118304 for a 2008 Toyota Sienna is generally stored in the rear cargo area and then draped through the seam of the rear hatch, like you said, when in use. The hatch seal is padded enough to protect and not damage the wiring. It's generally considered to be safer for the wiring to store it in the rear hatch because it isn't exposed to the elements when not in use.
view full answer... - Recommended Wiring Harness and Installation for 2008 Toyota Sienna with Tow PackageSounds like your factory wiring harness was damaged and you are looking to replace it with a new wiring harness. TowReady T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118304 is the correct wiring harness for your 2008 Toyota Sienna. Take a look at the installation video that I have included which shows the installation of # 118304. The 4 pole connector is designed to hang out the bottom of your back cargo door. I can't say whether the harness will fit through the grommet...
view full answer... - Troubleshooting Tow Ready Trailer Wiring Harness # 118304 Installation in Toyota SiennaThank you for your recent purchase. The two plug-and-play trailer wiring harnesses you have, Tow Ready part # 118304 for the Toyota Sienna, and # 118301 for GMC/Chevy and Isuzu pickups, both install inline with the pre-wired T-connectors to the vehicles' tail light wiring. The problem with erratic light functions that you describe is most often related to a grounding issue. You can begin your troubleshooting by confirming that the white ground wire with ring terminal is firmly secured...
view full answer... - Which T-One Trailer Wiring Harness Fits a 2004 Toyota Sienna Van?The T-One is a custom fit wiring harness, but part number 118381 will not fit your 2004 Sienna Van. This harness is custom fit for a full-sized Dodge van. We do offer a custom harness for the Toyota Sienna Van, the T-One wiring harness you need is part number 118304. For your convenience, I will attach links to the referenced products, a helpful FAQ wiring page and an installation video for the 2004 Sienna.
view full answer... - Trailer Wiring Harness Recommendation for a 2014 Toyota SiennaMost modern vehicles have more delicate taillight circuits than older vehicles. The wire that runs to the battery is used to protect the taillight circuits of your vehicle from being overdrawn by the additional load of the trailer lights. Trailer wiring harness with a wire that runs to the battery use the vehicle battery to power the trailer taillights and then only use the taillight circuits as signal wires. I can't recommend you install a wiring harness on your vehicle that doesn't...
view full answer... - Trailer Lights Not Working with 2008 Toyota Sienna with Never Used Tow Package WiringSince you have not used the trailer wiring harness on your 2008 Toyota Sienna until recently then there are a couple of likely things happening. First, the pins on the vehicle side connector could have corrosion in them even if the harness was stowed away the whole time. that can happen to untreated metal. Using a wire brush or screwdriver to clean out the metal contacts will help. The other thing to look at is the ground connection. This is usually a white wire. It needs to be connected...
view full answer... - Trailer Brake Lights/Turn Signals Not Working After Installing Wiring Harness on 2006 Toyota SiennaTo determine if the issue is on the trailer or the 2006 Toyota Sienna you will first disconnect the trailer from the van. Then use a circuit tester such as # PTW2993 to test the vehicle side wiring. First test the wires going into the converter box on harness # 118304 from the vehicle. Have someone sit in the cab and run through the light functions while testing the wires. If there is no power on the input wires for brake lights or turn signals, then there is something wrong with the vehicle...
view full answer... - Trailer Brake Lights Not Working when Connected to a 2006 Toyota SiennaYou can test trailer wiring harness # 118304 to determine if it is the problem or if the issue is somewhere else. You can use a circuit tester such as # PTW2993 or a meter if you have one to perform this test. Have someone sit in the vehicle and press the brake pedal. At the same time test the pins on the 4-Way, specifically the 2 that are the furthest from the exposed ground pin. If you are not getting power there when the brake pedal is pressed, then make sure your stoplight/CHMSL fuses...
view full answer... - T-Connector Trailer Wiring Harness Keeps Blowing Brake Light Fuse on 2007 Toyota SiennaIt is possible that the trailer lights have more draw than trailer wiring harness # 118304 can handle. It is rated for 2.1 amps per side for brake lights/turn signals and 4.2 amps for running lights. Your friend's truck is likely rated higher so it can handle the draw. If this does turn out to be the problem then switching to LED lights would solve the issue. The other option, since this is a recurring issue, is to replace the T-connector harness with a universal, powered harness that...
view full answer... - Troubleshooting 2008 Toyota Sienna With Trailer Running Lights Not WorkingThere is not a separate fuse in the wiring harness itself. Normally for the functions like stop and turn to work but the running lights not to work is a bad ground wire connection on the vehicle or the trailer. Running lights stay on, so they draw more current than the other functions. Check the wiring harnes ground wire (normally white) where it attaches to the vehicle and make sure you have a clean metal to metal connection. Also check the trailer ground for the same. Any corrosion,...
view full answer... - Wiring Harness, Sensor, and Electrical Problems After Installing a Spliced Wire Harness on a ToyotaThe item you selected, T-One Vehicle Wiring Harness, part # 118304, will work on your Toyota. There is another harness that will protect the vehicles circuits, the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, part # C59496. This kit only draws .5 milliamps from the vehicle lighting system and uses a circuit protected modulite that is a safe guard from short circuits or wiring shorts. Part # C59496 draws power directly from the vehicle battery, and only draws...
view full answer... - Hitch Recommendation for a 2004 Toyota Sienna Towing Small TrailerFor a hitch for your 2004 Toyota Sienna that will allow you to do some towing I would recommend the Hidden Hitch part # 87415. This is a Class III hitch with plenty of capacity that would work great for you. I attached an install video for you to check out as well. This hitch has the capacity for towing your small trailer and lawn mower, but you will also want to check the owners manual of your vehicle to determine the towing capacities of it as well and be sure to go with the lowest rated...
view full answer... - Best Trailer Hitch for 2007 Toyota SiennaTo tow a trailer with your 2007 Toyota Sienna, the best hitch is going to be the Class III Draw-Tite # 75237 over the Class III option from Curt because the Draw-Tite is rated for a higher capacity and is also the more economical choice. This hitch has a 2" receiver and 4,500 lb towing capacity, which is 1,000 lbs more than the capacity of your Sienna though please be sure to adhere to the 3,500 lb capacity of your vehicle. You are also gonig to need to add a 4-way connector # 118304 to...
view full answer... - Best Trailer Hitch for a 2010 Toyota SiennaI do have a trailer hitch for your 2010 Toyota Sienna but the one for a Toyota Venza will not fit as the vehicle's have a different rear subframe so the holes will not line up unfortunately. For your Toyota Sienna, I recommend using the Draw-Tite Max-Frame Trailer Hitch Receiver part # 75237 because it has the highest weight capacity of any other option for your vehicle and it has an integrated trailer connector bracket. The Draw-Tite Max-Frame Trailer Hitch Receiver is also a custom fit...
view full answer...
- Troubleshooting Trailer Wiring of 2009 Toyota Sienna with No Stop/Turn CircuitsIt sounds like a converter box issue on your setup. Can you test for voltage feeding into the box and coming out of the box? I'd be willing to bet you'll find it's going into the box fine but not coming out which means it has an internal short and would need to be replaced. We've found that the most reliable trailer wiring brand is Tekonsha so I would recommend replacing what you have with the part # 118304.
view full answer... - Trailer Hitch and Wiring Recommendation for 2007 Toyota SiennaThe best fitting and best priced hitch we offer for your 2007 Toyota Sienna is the Draw Tite part # 75237 which is a confirmed fit. This hitch has more than enough capacity for a jet ski trailer as well. I attached an install video for that for you to check out as well. For trailer wiring you then would want the part # 118304 which is confirmed as a fit and is the most reliable option we have. If you wanted to do some towing you might be interested in etrailer ball mount kit # 989900....
view full answer... - Turn Signal on 2004 Toyota Sienna Hyperflashes with Brake Pedal with Wiring Harness 118304 InstalledFirst let's make sure that everything is hooked up properly. The red and green wires on harness # 118304 will go to the passenger side and the yellow and brown go to the driver side. If those were swapped it could cause some issues. Also make sure that the white ground wire is attached to a bare metal surface. Moving the ground could help. Ground problems can cause all sorts of weird things to happen. To determine if the converter box is bad, you will need a circuit tester, # PTW2993,...
view full answer... - Trailer Wiring Harness for a 2009 Toyota SiennaNeither of the trailer wiring harnesses for the 2009 Toyota Sienna require a direct connection to the vehicle battery. Both Tow Ready harness # 118304 and Curt harness # C55580 plug in line with the vehicle tail light wiring and the only other connection that needs to be made is the ground wire. Some vehicles require a powered converter if there isn't a plug and play type of T-connector available or if the wiring is suspected to not be able to handle the power draw without a powered converter....
view full answer... - What Wiring Parts are Installed Where on a 2008 Toyota Sienna to Use a Magnetic Towing Light KitSince a Toyota Sienna has separate turn and brake signals, you will need a 4-Way harness with a converter. Part # 118304 is the proper 4-Way harness for a 2008 Toyota Sienna. It will plug into the the back of the tail lights, no splicing at all. You will also connect the loose white wire with the eye terminal to a good ground point on the metal body or frame of the vehicle. I have added a link to this part, the instructions for it and a video of the installation. Once you have this part...
view full answer...
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Kent
3/14/2024
I forgot it wasn’t original equipment. That’s how well it works.