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2019 Ford F-250 Super Duty
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
Item # 118378
Retail:$99.60
Our Price: $65.05
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2019 Ford F-250 Super Duty
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- All Info
- Reviews (103)
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Tekonsha Custom Fit Vehicle Wiring - 118378
- Custom Fit
- 4 Flat
- Trailer Hitch Wiring
- Tekonsha
- Powered Converter
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. Powered ModuLite reduces strain on wiring system.
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 point along frame rail
- Plug in connector
- Plug in fuse holder under hood
- Includes ModuLite to ensure that your vehicle'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: 7.5 amps per circuit
- 1-Year limited warranty
Installation
This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located at the rear, along the driver's-side frame rail. Once you've plugged in the tow harness connector, locate the gray connector between the truck's battery and the fender at the front of your vehicle. Plug in the fuse holder wiring harness. Then attach the ring terminal at the opposite end of the harness to the positive terminal on your truck's battery. Insert the included 10-amp fuse into the in-line fuse holder.
Once installation is complete, the 4-way flat connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.
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 vehicle'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 vehicle operate.
With a ModuLite, your trailer's lights will be powered without overloading your vehicle'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.
118378 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite
Installation Details
This Product Fits The Following Vehicles
- 2001 - 2002 Toyota Tundra
- 2001 - 2002 Toyota Tundra excluding factory towable bumper
California residents: click here
Customer Satisfaction Score:
92% were satisfied with this product
8% of customers were not satisfied
- Wrong item was ordered
- Product did not meet expectations
- Alternate product found
Customer Reviews
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118378
Average Customer Rating: 4.8 out of 5 stars (103 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. Powered ModuLite reduces strain on wiring system.by: Cal 05/04/2024
2002 Toyota Tundra
Perfect fit for my older truck. Easy to install
by: Daniel09/14/2023
I've had this for over a year in my Toyota Tundra that I don't treat very easy.
Still working great!
by: Christopher 07/22/2023
2002 Toyota Tundra
Well made and plug and play for my 02 Tundra. It took 20 min to install. No cutting or splicing. I purchased along with a universal 7 pin kit for trailer brakes. It's perfectly compatible.
by: William D.09/04/2018
2002 Toyota Tundra
etrailer made the process quite simple. Online videos, written instructions, 2 day delivery all contributed to a painless process. '02 Tundra with 320k miles. Everything fit perfect.
by: TVillainX05/11/2019
2002 Toyota Tundra
This is the easiest trailer wiring kit that I've ever used. There was no drilling for a ground screw, no running a power wire the length of the vehicle, no disassembling the taillights. The Tundra already had the modular connectors, all we had to do was tap into them. The hardest part was deciding where to put the zip-ties. This is a great product and I highly recommend it.
by: Mike K06/30/2015
2001 Toyota Tundra
The harness I ordered was installed on mu 2001 Tundra in ten minutes. Easy, excellent delivery time and completely satisfied. The boat goes to the lake tomorrow with every light on the trailer working. The videos were an excellent source for me. Reading instructions is not my strong suit.
Michael K.
6/29/2016
This product is working just fine. Makes me feel like a competent install mechanic.
by: Toby J10/15/2016
2002 Toyota Tundra
Was exactly as described. It took me less than 10 minutes to get the whole setup installed and tied up. The communication and shipping from ETrailer has be way above top notch. Highly recommend this company
Toby J.
10/15/2017
Haven’t had any issues. Still works same as Day I installed it
by: Bob T08/29/2013
Toyota Tundra
I've had a Hidden Hitch and wiring harness on my Toyota Tundra for a number of years. When I needed to get a 7 way plug I found that the old wiring didn't work. So I repmaced it and added a plug. The installation was easy and it works great. I wish there had been a single harness but replacing the old one and adding the 7 pin was very simple. I got great service from E-trailer and the video's were a good help. I'll use them again!
by: Lane11/13/2021
I never got my wiring harnesses something must’ve happened when you guys sent it.
Jenny N.
12/1/2021
I will have our customer service team reach out to you.
by: Excellent product, fast shipping, even better cust04/18/2019
The product is exactly as advertised and arrived on time. Installed it and looks great.
Let me just start by saying that the product itself is not the most important thing. How many companies or sellers out there are reaching out to you and make sure that their product arrived on time and it met your expectations? And if not, following up and making sure they change that!? I am a big fan of etrailer and you have a great model going, keep up the good work and creativity to always stay a step ahead of the competitors.
BUYERS - Buy with confidence! You have nothing to lose when you are dealing with a seller that stands behind their product and customer satisfaction is their first priority!
Shoutout to Tommy C!
by: Giris08/28/2012
2001 Toyota Tundra
The harnesses plugged right up and worked perfectly.
Great product!
Communication from eTrailer was the best. Package tracking was weak and did not provide enough info.
The eTraller website is easy to use & provides great info & instructions on the produce installation. Because the instructions were so good the purchase decision was no-brainer.
I definitely make eTrailer my first look for this kind of product.
by: Thomas07/11/2020
My 2002 Toyota Tundra was not powering my boat trailer properly. After a bunch of testing the Tundra wiring I isolated the problem to the Toyota converter/power module. I found a replacement wiring harness at etrailer that matched my vehicle. I have received the new wiring harness and reviewed the installation instructions. Everything seemed to match up to my existing Toyota wiring harness which gives me a lot of confidence the installation will be a no-brainer. If I do have questions or problems I am confident the etrailer staff will be responsive and able to help me out. Although I do not expect that that will necessary. etrailer kept me informed throughout my purchase transaction from confirmation of my order through delivery. I will definitely use etrailer again.
by: Ridge W.11/22/2013
2001 Toyota Tundra
The T one wiring harness for my 01 tundra worked perfectly , I watched the installation video on the website and when it arrived it took less than ten minutes to install . E - trailer's description and customer service were excellent I highly recommend them and their products.
by: Dan C06/20/2012
2002 Toyota Tundra
Needed this harness for my 2002 Tundra. The Tundra owners manual leads you to believe that the factory harness is ready to haul a trailer, but this is not accurate. I installed the T-One Vehicle Wiring Harness with 4 Pole Trailer Connector with no difficulty in about an hour (and that was taking my time!). Instructions were clear and had good photos. Product arrived faster than I expected, and customer support was quick to answer a question about which rear truck connector to use (it is NOT the connector just behind the license plate, but in my case over on the far left side behind the tail light). I will definitely shop at Etrailer again.
by: Mike04/23/2012
What can I say? This was the easiest install I've ever done. It literally took me 25 minutes to remove the old harness, then install and test this wiring harness and this is the first time I've installed anything like this. Etrailer responded to my online order within minutes and I had the kit delivered in 2 days. Great service, great product.......I'll be back in the future! Thank you etrailer.
by: Russell T.02/19/2017
2002 Toyota Tundra
The trailer wire harness and mounting bracket for my 2002 toyota tundra came in on time and was easy to install. It took about 20 minutes from start to finish. I appreciate everything and will shop with etrailer in the future.
by: David 10/18/2022
2002 Toyota Tundra
Worked perfectly on 2002 Toyota Tundra.
by: JAZ_Picayune10/28/2014
2002 Toyota Tundra
Very easy to install, perfect fit with the truck's existing connectors, good quality, and most important, worked flawlessly. I do recommend this product from etrailer.com.
by: John07/16/2021
I had to return the first harness, it was my mistake. The person on the phone was very understanding and found the exact trailer wiring harness I needed, it was an older vehicle, hooked up perfectly!!
by: Matt in Upper Michigan09/18/2012
Had a positive experience with the wiring package I ordered through E-Trailer. Sales rep was knowledgable, friendly, and competent. Price and shipping costs were very fair.I received the package quicker than I expected and was happy to see the item was correct and exactely what i needed.
by: JimK09/17/2016
2002 Toyota Tundra
Works, Double sided tape came off - Used this one to replace same unit I bought 2 years before that died. If this one lasts only two years I will have one wired in.
Was very simple to wire in.
by: Andy01/21/2017
This was an outstanding "plug and play" purchase. Etrailer continues to impress me with their DIY videos and ease of installation. This was a piece of cake to install. Continue the great work etrailer!!!
by: Jerry06/09/2019
Instructions easy to follow. Received exactly what I wanted and worked as advertised. Took about 15min to install. Would recommend to anyone needing a trailer light harness.
by: Tim04/21/2017
2001 Toyota Tundra
I had this installed on my truck 10 minutes after taking it out of the mailbox. The video tutorial was great. The hardest part was getting the cap of the plug next to the battery.
by: Robert03/21/2023
Good quality
25
103
Show More Reviews
See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring
- Trailer Hitch that Fits 2002 Toyota Tundra with Towable BumperThe Curt hitch part # 13184 is the correct hitch for your 2002 Toyota Tundra that has the towable bumper. This hitch has a towing capacity of 5,000 lb. I attached an install video for it for you to check out as well.
view full answer... - 7-Way Trailer Wiring Recommendation for 2002 Toyota TundraIf you removed all of the wiring of your 2002 Toyota Tundra when you removed the bed you'd want a 7-way kit like the part # 20023 which will wire into the truck's current wiring. Otherwise the 4-way kit part # 118378 plugs into factory wiring to provide a 4-way. To convert the 4-way then to a 7-way so you can install a brake controller will require the install kit part # ETBC7. I attached a couple install videos for these kits for you to check out as well.
view full answer... - Trailer Wiring Solution for 2002 Toyota TundraIt's hard to say but there is a pretty good chance a 2001 Toyota Tundra with a factory hitch came with trailer wiring. If you needed wiring though the part # 118378 is a custom fit option that would work well. This will give you a 4-way wiring harness.
view full answer... - Parts Needed to Install a 7-Way Trailer Connector on a 2001 Toyota Tundra With Existing 4-WayYour best option is to install our Universal 7-Way and 4-Way Installation Kit, part # ETBC7. There are no plug-in style 7-way trailer connectors that will replace the Tow Ready harness on your truck, but the ETBC7 will use your existing 4-way and provide the additional hardware and wiring needed to have a fully functioning 7-way trailer connector. I attached an installation video on a 2002 Toyota Tundra to give you an idea of what will be involved with the installation. The installation...
view full answer... - How Long Would it Take to Install a Tow Ready Wiring # 118378 on a 2002 Toyota Tundra SR5This T-One Vehicle Wiring Harness with 4 Pole Trailer Connector, part # 118378, installs very easily. After looking at the instructions it looks like it should only take about twenty minutes or so to install this product on your 2002 Toyota Tundra SR5 Access Cab with a Lift Gate. Aside from needing access to basic tools, this product comes with everything you would need to install the # 118378. I attached installation instructions below for you to check out also. These should give a pretty...
view full answer... - Low Voltage From Converter 4-Way With Curt Harness on 2001 Toyota TundraIf you checked the wires right before the converter box of the Curt T-Connector Vehicle Wiring Harness # C55378 for your 2001 Toyota Tundra and got 12 volts, but then tested the wires coming out of the converter and got almost nothing, the issue will be a bad converter, which is rare but happens on occasion. I also do highly recommend going with a Tekonsha wiring harness for your 2001 Tundra, as they make the most reliable harnesses. The correct part for a 2001 Tundra is the Tekonsha T-One...
view full answer... - How to Install a Brake Controller in a 2002 Toyota TundraI have a way for you to install either a P2 Brake Controller part # 90885 or a P3 # 90195 in your 2002 Toyota Tundra but there isn't a plug-in adapter available that would work. You will need to hardwire the controller in. Since you do not have a factory trailer wiring you will need to start with a 4-way (if you do not have one). For that you would want the # 118378. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will...
view full answer... - Trailer Light Not Working and Wiring Harness Show No Power on 2002 Toyota TundraFirst, what I recommend is checking the converter box in the trailer wiring, # 118378, to determine if it is the harness or the truck that is the problem. Use a circuit tester like # PTW2993 if needed to test the wires going into the converter box from the truck. If the signals are correct going into the box, you know that the truck is not the problem. Then test the wires coming out of the converter. If the signals are all correct coming out of the converter, the problem is somewhere...
view full answer... - Wiring Harness with OEM Connectors for 2002 Toyota TundraThank you for the photo of your 2002 Tundra's wiring connector. We do not offer any auto maker's OEM-style connectors by themselves, only as part of wiring harness products like T-One Vehicle Wiring Harness # 118378. The photo I linked shows the OEM-style connector on this item. You may need to go to a Toyota dealership or auto parts stores for just the connectors.
view full answer...
- Trailer Wiring Harness for a 2002 Toyota TundraI went out to the warehouse and pulled the trailer wiring harness, # 118378 to take a look at the plugs. There are actually 2 plugs, one that connects to a power receptacle on the truck for power and another one that plugs into the back where your receptacle is located. The harness does have 3 rows of plugs but the center row does have one pin right in the middle of the plug. This harness is the correct one listed for a 2002 Toyota Tundra. Take a look at the instructions for the harness...
view full answer... - Does the Tow Ready Harness # 118378 Ground Separately or Through the Converter Box HarnessThere isn't a dedicated ground wire that needs to be ran to install the # 118378 harness you referenced. It grounds through the connection that the harness with the converter box is attached to. You only need to make that connection and then connect the other included harness to the positive post on your battery and it will be fully functional. I attached installation instructions and an install video for more info.
view full answer... - Truck/Trailer Brake Lights Come on with Trailer Connected and not Using Brakes, 2001 Toyota TundraFrom what I have been able to gather, the 2001 Toyota Tundra did not come with a tow package that included trailer wiring connections. This could mean that it was done aftermarket and could have been wired incorrectly by a previous owner. Or there could be a bad ground issue causing the malfunction. I recommend checking the ground connections on the truck and trailer side connectors. They will need to be clean and free of corrosion. I spoke with one of our installers about this problem....
view full answer... - Correct Trailer Connector/Wiring Harness for 2002 Toyota TundraI belive yoiu've found the wrong connector, as the connector you're looking for is located on the driver's side frame rail just forward of the rear bumper as shown in the linked video. The # 118378 converter and harness you'd looked at is the correct for your 2002 Tundra. You'll also need our # ETBC7L wireless brake controller installation kit, I've also included a link for a video explaining how the kit works.
view full answer...
- Is the Curt Converter Box for a 2002 Toyota Tundra Replaceable The converter box for the Curt T-Connector Vehicle Wiring Harness part # C55378 is not available as a separate replacement part unfortunately. However, I actually recommend you take a look at the T-One Vehicle Wiring Harness part # 118378 instead which we have found to be much more reliable. The issue that causes the converter boxes to fail is excessive movement. The above Curt converter box attaches using adhesive which is not always the best method. The Tekonsha converter box attaches...
view full answer... - Transferring Prodigy P2 # 90885 Brake Controller from Ford Explorer to Toyota TundraSince trailer brake controllers are not vehicle-specific you can indeed transfer your Tekonsha Prodigy P2 # 90885 from your Ford Explorer to your 2001 Toyota Tundra. You will need the trailer brake install kit # ETBC7 that you referenced. If your Tundra does not already have a working 4-pole flat trailer connector at the rear bumper you will first need to install one. There are both hard-wire types (cutting and splicing required) and custom-fit plug-in types, which is what I suggest. You...
view full answer... - Availability of Brake Controller Harness for 2001 Toyota TundraIf you are looking for a brake controller harness, there are none available for the 2001 Toyota Tundra. The 2001 Tundra did not have factory tow packages as an option, so a brake controller will have to be hard wired into the vehicle. You will need part # ETBC7 to create a 7 way plug at the rear of the truck. I will include a video on this kit. You will also need to install a 4 way connector. Toyota put the provision in for this so you will need part # 118378. Once you have these parts...
view full answer... - Backup Light Connection For Activation of Surge Coupler Backup Solenoid on a Toyota TundraThere are two options for energizing the backup solenoid on your trailer to allow you to backup. The first is an adapter like you mentioned. The 4 Pole to 5 Pole Trailer Wiring Adapter, # 20036, is designed to be easily installed and removed once the blue wire is spliced into the vehicles reverse light circuit, behind one of the rear tail lights. A circuit tester, # 3808 if needed, is required to determine the correct wire to splice the blue wire to. The second option is to use a 5-Way...
view full answer... - 2002 Toyota Tundra Does Not Have Correct Plug to Match Recommended Custom Wiring, What Can I Use?It looks like the 2002 Toyota Tundra should have an 8-pin square connector on the rear of the vehicle for the trailer wiring, and from the photo you're showing that is definitely not an 8-pin square connector; it's a 6 pin square. One of two things could have happened here. I would first make sure that you've pulled the correct plug, since there are two very similar plugs placed right next to eachother on the 2002 Toyota Tundra. I've taken a screenshot of our installation video as a reference...
view full answer...
- Why Are My Trailer Taillights Staying On when Using the Curt Harness # C55378?If you have tested the Curt Harness # C55378 with a circuit tester on your 2001 Toyota Tundra, there should not be any signal to the plug when the vehicle has the lights off and there should be power to the lights when the vehicle is turned on. If you tested and there is a signal with the lights off, there is a problem with the vehicle's-side of the connection. To rule out any issues with the vehicle's-side of the wiring, make sure that there are no frayed/pinched wiring and that the ground...
view full answer... - Can You Give Detailed Step By Step Instructions For Brake Controller Install On 2001 Toyota TundraTo install a brake controller on your vehicle you will need Brake Controller 7 & 4 Way Installation Kit, part # ETBC7 and the Tow Ready Custom Fit Vehicle Wiring, part # 118378 on your 2001 Toyota Tundra. If your 2001 Toyota Tundra has an existing 4-way connector, you will not need to install part # 118378. For installation of part # 118378, start by disconnecting the negative terminal on the battery and remove the battery hold down bracket and slide the battery towards the motor. Next,...
view full answer... - Low Voltage on Factory 4-Way Trailer Connector on a 2002 Toyota TundraIf the factory tow package wiring on your 2002 Toyota Tundra uses both fuses and relays then the issue could be a faulty relay. They can sometimes still allow some power to trickle back even if they are bad so that is one thing to check. There could also be a corrosion issue, ground problem, or wiring problem. If you are testing the pins on the 4-Way go ahead and test one of the wires going to the connector instead. If you get the proper voltage on the wire but not the pin then it is...
view full answer... - Does a Wiring Harness Come with a Trailer Hitch for a 2002 Toyota TundraTrailer hitches including # 75105 do not come with wiring harnesses. The reason is that some people aren't using the hitch for towing while others could be replacing a hitch and already have wiring. For your 2002 Toyota Tundra you can use # 118378 to add a 4-Way connector. If you need to add a 7-Way you would also need # ETBC7 in addition to the 4-Way. I have included some links that show and explain the ETBC7 installation for you.
view full answer... - Do I Need to Install a 4 Way Connector Before Installing a 7 Way ConnectorA 4 way connector like the Tekonsha # 118378 provides the base functionality and connections to the brake lights and turn signals, plus adding a converter box that are needed for a fully functioning 7 way connector. With that said, if you don't want to install the 4 way first, you could hard wire in a 7 way like the # HM40975-11998. Most people prefer the ease of installing a plug and play 4 way option in order to avoid any potential wiring issues, so it's usually the preferred method. If...
view full answer... - What Parts are Need to Add a 7-Way Trailer Connector to a 2001 Toyota TundraI do have a solution for you. In order to add a 7-Way wiring harness to your 2001 Toyota Tundra, you will need to start by adding a 4-Way, # 118378, if you need one. I have included a link to the installation instructions for this harness for you to view. With a 4-Way installed (or using an existing 4-Way if applicable) you will then need to install a 4 and 7 Way Installation Kit, # ETBC7. This kit includes everything you will need to install a functioning 7-Way on your truck. I have included...
view full answer...
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Video Edited:
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Tvillainx
5/12/2020
Still perfect - one year later!