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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. 4 Flat
  4. No Tow Package
  5. Trailer Hitch Wiring
  6. Vehicle End Connector
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1994 GMC Sonoma
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CURT

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Part Number: C56020
185 Reviews | 99 Questions
In Stock
$40.90
Retail:$67.95
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 Custom Fit Vehicle Wiring
Not Confirmed to Fit

1994 GMC Sonoma

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2004 ford van custom fit vehicle wiring curt trailer hitch 4 flat c56020
2004 ford van custom fit vehicle wiring curt trailer hitch 4 flat t-connector harness with 4-pole connector
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C56020 or order online at etrailer.com. Free expert support on all CURT products. Great prices and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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CURT Custom Fit Vehicle Wiring - C56020

  • 4 Flat
  • No Tow Package
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Plug-In
  • Plug and Lead
  • CURT
  • No Converter
  • Hidden

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required.


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
  • Comes with dust cap for 4-way flat connector
  • Limited 1-year warranty


Installation

This custom-fit T-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 and interior trim paneling to access this harness.


Once installation is complete, the 4-way 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.



56020 CURT T-Connector - 4 Wire

Installation Details C56020 Installation instructions

This Product Fits The Following Vehicles




Customers Who Purchased This Custom Fit Vehicle Wiring Also Bought...



Customer Satisfaction Score:

Ratings & Reviews

4.6

185 reviews
5 Stars
(150)
4 Stars
(19)
3 Stars
(5)
2 Stars
(3)
1 Star
(8)
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by:
2 stars for the wire harness, see pictures. #3704 is factory
what was supposed to be the trailer ground was B+ from the passenger side taillights.
They used white wires for both the ground and the taillight circuit???
#3705 is after I rewired it so the ground didn't spark! Everything works now
by:
The Curt T- Connector vehicle wiring harness with 4 pole flat trailer connector does not work. As soon as you connnect a trailer to the vehicle and turn on your head lights or parking lights, the fuse blows on the vehicle preventing the trailer brakes, vehicle brakes and parking lights from working. Basically at night you are driving without any lights for people to see.
Mike L. profile picture
Etrailer Expert

Mike L.

4/15/2026

Did this happen with a trailer connected or with no trailer? Which fuse(s) blew?

by:
The Curt T- Connector vehicle wiring harness with 4 pole flat trailer connector does not work. As soon as you connnect a trailer to the vehicle and turn on your head lights or parking lights, the fuse blows on the vehicle preventing the trailer brakes, vehicle brakes and parking lights from working. Basically at night you are driving without any lights for people to see.
by:
2013 Ford Van
Installation as directed. It keeps blowing parking light fuse. Turns out two white wires are reversed from the factory. Reviews on Amazon show nearly half of purchasers are having this issue. Sone got replacement and it does the same. Others are just having to modify it. Might as well have wired it direct to van wiring.
Called curt, they don't know of this issue ...they say.
by:
2014 Ford Van
Work as designed. No installation issues.
by:
Package came as expected. Easy to install. I would order again.
by:
It’s not good man. The T connector works fine. The seven pin adapter has a manufacturers defect somewhere in it. Every time I plug it in it blows my fuse. I had to run to O’Reillys to purchase a different seven pin adapter. That one works fine. I need to return the one you sent me.
by:
2006 Ford Van
Father put this on his van within minutes. Haven’t tested it out with the trailer yet, but installation was a breeze
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by:
Excellent experience. Customer service person was very knowledgeable. She found the right part for my van quickly. She asked several questions to make sure I was getting the right pat and also everything else I would need for the install. She shipped the hitch and electrical assembly the same day for next day delivery. As soon as it shipped she sent my tracking number and followed up with me a soon as it arrived to make sure everything was good.

My mechanic had no problem with the install - perfect fit. This is my third order with etrailer. I'll ever buy any where else.
Jay profile picture

Jay

11/21/2017

Everything still working flawlessly Thank you

by:
2013 Ford E250
The product is great. It went on a 2013 Ford E250. Loved the factory connections. It made the install easy. I ran the harness down through the opening for the spare tire lock instead of letting it hang out the underside of the rear door. Also, I ran the driver-side line under the plastic molding along the floor as opposed to going over the door frame. I had to do that since I ran the harness out the spare tire lock opening. I wanted this harness to remain in place all of the time without worrying about damaging it during loading and unloading.
Brian profile picture

Brian

2/25/2015

Still good. No problems with this product, at all.

by:
2005 Ford Econoline
I have ordered from this site before and never had any problems. I was disappointed in this purchase though because it describes the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56020 to fit ANY 04-13 Econoline Van which is not true. It DOES fit any passenger or cargo Econoline Van. If you own a Regency(conversion style) van it does not fit without extreme modifications. Etrailer.com is an amazing company and has always been easy and great to deal with! I love this site and will continue to use them!
Patrick B. profile picture
Etrailer Expert

Patrick B.

5/30/2014

Our hitches and wire kits are designed to fit OEM production vehicles, as they roll off the assembly lines. Aftermarket modifications, including conversions, make changes to the vehicle and some can affect compatibility. A van conversion involves major modifications including changes to the electrical systems.

by:
2007 Ford e-350
This harness is truly plug-n-play. Couldn't be any easier. If you know how to use a screwdriver, you can install this. Put it on an '07 E-350 Ford van, and it works great. Karen @ etrailer knew just what I needed & recommended this product, and I'm glad she did. Thank you Karen!!! 1st time ordering from etrailer, and I will certainly order from them again!!
James B. profile picture

James B.

9/20/2018

The plug-n-play wiring harness has been working flawlessly. I couldnt be any more satisfied. I also ordered a custom fit hitch receiver at the same time, and it has been great. Installation instructions were very clear, and installed it in about 10 minutes with no drilling whatsoever. Just what I wanted & needed. The best part... everything was shipped to my doorstep and I saved over $100 from my local auto parts store. Im a very satisfied customer, and have recommended etrailer to all my friends.

by:
2011 Ford Van
fit and worked perfectly. Would be nice if a piece of sheathing to protect the wires where it has to go over pinch welds behind the plastic trim panels were included. Otherwise a dozen wraps with electrical tape takes care of that.
Twiisted71 profile picture

Twiisted71

9/19/2016

Works perfectly. Lookig back however I wish Id gone to the trouble of installing a 7-way brake harness

by:
Fine. The directions and video could be improved since no one mentioned the back up lights really did not need to be involved with the connections. Just the signal and brake and lights are unplugged and replugged. Textbook vs reality.
Craig D. profile picture

Craig D.

7/7/2015

Just fine.

by:
2012 Ford Van
Connectors did not fit through grommeted opening on floor. Wound up cutting the grn/wh wire and fed from top down then spliced them together. Not ideal but better than enlarging opening in floor. Connectors on taillights fit well. Overall happy with item.
Jenny N. profile picture
Etrailer Expert

Jenny N.

2/23/2022

For this harness you would want to remove the grommet and cut a slit large enough to route the custom wiring harness though. I recommend viewing our video install on a 2011 Ford van.

Helpful Links

tv-install-trailer-wiring-2011-ford-van-c56020.aspx

by:
2010 Ford Van
Easy to install, good fit to existing wiring, although the pigtail to the trailer plug could be a little longer (6" more?), but long enough for my trailer wiring to reach the plug. I think I should have bought the unit that had a control box included, because my turn signals flash as if there's a bulb out from the extra draw to the trailer (only turn signals, NOT with the 4-ways . . . ). Not a big deal, gets the job done, the fast signal is a small issue.
by:
2012 Ford Van
this wire harness ws put on 2012 Ford van, it was easy and fast, the quality of the
components' was great, compared to other products that I had purchased at
Harbor tools. Great product and easy instructions.
Daniel P. profile picture

Daniel P.

10/24/2017

Working just fine , and so easy to install, thanks

by:
2006 Ford E-250
Customer service was great. Had to call them to discuss my needs, they knew what they were talking about and sold me the right parts. Install was simple when following the instructional video they have on this site. Very nice having that resource, more helpful than a phone call because you can pause it. :) I installed a flat four and a seven pole with a trailer brake controller to my 2006 E-250 van, worked the first time with no blown fuses like the old days.
Peace,
Marc
Alpena, MI
by:
Very durable and easy installation. I’ve made multiple 400 mile trips with 6x12 uhaul trailer full of custom cabinets (easily a few thousand lbs) and have had no trouble at all. I installed the hitch in about an hour in the dead of winter. Would’ve taken half the time if it wasn’t so cold.
by:
2005 Ford Van
I ordered a Curt trailer hitch receiver and the Curt T connector wiring harness from e-trailer for one of our work vans. It was here in a couple days. I watched an installation video on e-trailers website and had everything installed, including the wiring harness in about 30 minutes. It was a piece on cake. E-trailers website makes it very easy to find what equipment to use on your rig. I will most certainly go through e-trailer again!!!!!!!!!!!
by:
2012 Ford Van
Plugged in easily and worked perfectly. I can't say enough good things about etrailer. Great customer service. Even if things don't go as planned they make it right.
Jason profile picture

Jason

8/11/2016

No problems at all. Functions perfectly

by:
As promised the harness wired up directly to the existing vehicle wiring harness the instructions were clear. Also the trailer hitch was very easy to install, and the video on your website is excellent. I would certainly recommend these products and your company to anyone in search of a trailer hitch.
by:
2004 Ford Van
Simple installation if used as suggested. I installed this a little bit different than suggested. This was intended to be installed and routed into the cargo area of the E350 van. We didn't want the wires in that area due to constant use and fear of damage. We drilled holes under the tail lights to route wires out side the van. This also required that we cut the harness wires after the connectors to route the wirw. Installed we had no issues. This just took a little thought to make it work to our requirements.
by:
2004 Ford Van
This product is great! After buying the standard U-Haul wiring kit, and then spending hours taking apart the back of my E-350 and the wiring bundles only to find out that the wiring colors didn't match what I needed to splice into, I gave up and did some more on-line research. Thankfully I found this product, which is made by the same manufacturer as my hitch. Installation was straightforward and went without a hitch (no pun intended), and it worked perfectly on the first try and ever since. Thanks!
by:
2011 Ford Van
The hitch that i purchased is better looking than i expected, it took me less than 30 minutes to install, no drilling required. The light harness couldnt been more easier to install. Now i can tow my gear every where! With my Ford 2011 E350
Etrailer.com make buying gear for your vehicle easy , even when your not sure what products work best for you. Plenty of information
Love the videos and fotos.
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See what our Experts say about this CURT Custom Fit Vehicle Wiring

Do you have a question about this Custom Fit Vehicle Wiring?
  • Recommended 7-Way Trailer Wiring On 2007 Ford E-350 Super Duty Van
    If you don't already have a 4-way wiring harness, we need to start there to get your 7-way. For a 4-way, I recommend the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56020 which plugs in behind the tail lights of your 2007 E350. You will have to remove the tail light assemblies and interior trim paneling to access the factory connections. I've attached a video to help. Then you will use the Universal Installation Kit for Trailer Brake Controller - 7-Way...
    view full answer...
  • Setting Up a 2009 Ford E-350 Van without Factory Towing Package for Brake Controller Wiring
    There are 3 options from the manufacturer for the 2009 E-350 Ford Van. Factory 7-Way trailer wiring, factory 4-Way trailer wiring, and no existing trailer wiring. I will go over all three since you did not indicate which one your vehicle has. If you have the factory 7-Way trailer wiring, you will be able to use the 3034-P wiring harness that you selected to easily install your prodigy brake controller. When looking for a port under the dash, it will be near the top of the instrument cluster,...
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  • Why is My Number 10 Fuse Blowing When I Hook My Trailer Up to My 2006 Ford Van?
    Hi Bry, It looks like the issue might not be with the brake controller after all, but possibly with the wiring. If your #10 fuse keeps blowing when you hook up your trailer to the CURT # C56020 T-Connector on your 2006 Ford van, it’s likely due to a short somewhere in the trailer’s wiring, especially in the running lights, which that fuse typically protects. Common culprits include pinched wires, corroded sockets, bad bulbs or LEDs, or a poor ground. Occasionally, the trailer plug might...
    view full answer...
  • Parts Needed to Install 7-Way and Brake Controller in 2006 Ford E-350 Van
    You will need to start with a 4-way (if you do not have one). For that you would want the # C56020. 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 want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions and an install video for this product as well. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake...
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  • Parts Needed to Add 4-Way and 7-Way to 2013 Ford E350
    Hey Tester, what you'd need is the Curt 4-way part # C56020 and then convert it to a 7-way with the part # 37185 which has a 4-way on the side of it. Does your trailer have brakes?
    view full answer...
  • Troubleshooting Curt 4-Way 2006 Ford E-350
    Hey Florence, it sounds like the connectors of the Curt 4-way kit part # C56020 that you referenced aren't all the way seated and that is why the taillight circuits aren't working like they need to. I would try unplugging them and plugging them back in firmly to see if the problem goes away.
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  • Trailer Hitch and Wiring for 2010 Ford E-450 Mobility Bus
    Hi Mark; we don't have a hitch or wiring specifically for the E-450 but you can see if the Draw-Tite Max-Frame Trailer Hitch # 75703 will fit. I have attached the full dimensions below so you can compare those to what you have on your frame to see if it will fit. If it doesn't match up the only option is to add a universal weld-on hitch like # 41990-07. If the connector on the # HM11140665 doesn't match the connector you have there are no other custom wiring harnesses available. The #...
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  • Recommendation for a Trailer Hitch to Fit a 2006 Ford E-350 Van
    For your 2006 Ford E-350 van, I recommend the Curt Class III Receiver Hitch, # 13055. The hitch has a 600 lbs tongue weight capacity and a 6,000 lbs towing capacity. What I like about this Curt hitch over the other brands we carry is the ease of installation. The Curt hitch will install to the frame of your Ford using already existing bolt holes. There will be no drilling required making installation less labor intensive. If you are going to use the hitch to tow trailer, then you will...
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  • Parts Needed To Add 7-Way Trailer Wiring And Brake Controller To 2014 Ford F350 Van
    Hey Frank, thanks for reaching out. Yes, we do have exactly what you need to add trailer wiring and a brake controller to your 2014 Ford E350 van. Here is what you'll need: - Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56020 - Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires # ETBC7 Those two kits combined contain everything you need to wire the van with a 4-flat/7-way combo, including all of the necessary...
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  • Parts Needed to Install Curt Spectrum in 2006 Ford E-350
    Hey Nathaniel, we can definitely help you install the Curt Spectrum Brake Controller part # C72SV in your 2006 Ford F-350 but if you don't have the factory 7-way you wouldn't have the factory tow package so you would need to hardwire this controller in. If you don't have a 4-way you'd need to start with that with the part # C56020 and then to convert to a 7-way so that you can wire in a brake controller you'd also need the part # ETBC7 which comes with everything needed to also wire in...
    view full answer...
  • Trailer Hitch and Wiring for a 2014 Ford Van
    Thanks for reaching out Danny. For a hitch on your Ford van, we have a couple of options depending on what you're planning to tow. The Curt Trailer Hitch Receiver # 13055 is a Class III hitch rated for up to 6,000 lbs of gross trailer weight and 600 lbs of tongue weight. If you need something a little heavier-duty, the Curt Trailer Hitch Receiver # 14055 is a Class IV hitch rated for up to 10,000 lbs of gross trailer weight and 1,000 lbs of tongue weight. You didn't mention the specific...
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  • Recommended 7-Way Wiring Harness for a 2014 Ford E350 Van
    Hey Frank! It sounds like your 2014 Ford E350 van doesn't have the factory towing package so you will need to install two harnesses to add a 7-way connector. The first one you'll need is the Curt item # C56020. The custom fit t-connectors plugs into your Ford's existing wiring behind the tail lights. It will provide you with a 4-way connector. The second harness you will need is the Universal Installation Kit item # ETBC7. The kit includes a pre-wired 7- and 4-way trailer connector that...
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  • Troubleshooting Curt C56020 Not Working Correctly On 2006 Ford E350 Passenger Van
    Hello Armstead, thanks for reaching out. It sounds like the plugs/connectors on the Curt # C56020 wiring harness are not seated all the way. This is actually kind of common with these harnesses and it would explain why the lights are working that way. Try unplugging both sides and plugging them back in firmly to see if the problem goes away. Make sure the vehicles connectors are not bent or rusted. This wiring harness does not have a converter module so there really aren't any other troubleshooting...
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  • Trailer Hitch and Wiring Recommendation for 2013 Ford E-250
    Hey Gregory, for your 2013 Ford E-250 the highest capacity hitch we offer is the Draw Tite part # 41945 which is rated to tow up to 10,000 lbs. For trailer wiring the best option would be the Curt part # C56020 which plugs inline with the taillight connectors of your van and provides a 4-way. Since you probably have trailer brakes you'd need to convert that to a 7-way so you can install a brake controller as well. For that you'd want the part # ETBC7 and for a brake controller the P3 # 90195.
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  • Best 4-Way Wiring for 2006 Ford E-150
    Hey Zach! The Curt T-Connector Vehicle Wiring Harness # C56020 you were looking at is the best option for your 2006 E-150. This plugs into the connection points behind your rear tail lights for a quick and easy installation. Do you need the 4-way for towing or something else?
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  • Brake Controller and 7-Way Recommendations for 2008 Ford E250
    Hey Tim, for your 2008 Ford E250 van the Tekonsha Prodigy P3 part # 90195 would be a really great option. To wire it to your van you'd first need a 4-way like the part # C56020 and then to convert it to a 7-way so that you could wire in a brake controller you would need the part # ETBC7 and you'd have everything. I attached an install video for this that will walk you through the entire process as well. The P3 is widely considered to be the gold standard for brake controllers because...
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  • Parts Needed to Add 7-Way to 2014 Ford E-350
    Hi Jon; do you have the E-350 van? If so you can add a 4-way using the # C56020. If you have any other version of the E-350 you will need the universal # C59236. Once you have your 4-way you can upgrade it to a 7-way using the # ETBC7. If this is a van the wiring that comes with the kit will be adequate. If you have some kind of motorhome or box truck built on an E-350 you will probably need extra wiring # 10-2-1.
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  • Recommended 7-Way Wiring and a Brake Controller for a 2013 Ford Van
    Hey Glenn. To add a 7-way connector and a brake controller to your 2013 Ford E-350 you'll first need to have a 4-way. If your van doesn't have one you'll want the Curt T-Connector Vehicle Wiring Harness item # C56020. This custom fit wiring Harness connects to your Ford van's existing wiring behind the tail lights. The second harness you will need is the Universal Installation Kit for Trailer Brake Controller item # ETBC7. The kit includes a pre-wired 7- and 4-way trailer connector that...
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  • Troubleshooting Dim Trailer Lights and Hot Wires From 4-Way on 2006 Ford Van
    Hi Hayden; based on what you're describing, and the fact that this started before you installed the # ETBC7, I think it is your 4-way wiring. With the lights getting dim and the wires getting hot I think you're overloading the circuit between the vehicle lights and trailer lights. More than likely you have a wiring harness like the # C56020 without a converter. I would switch to a wiring harness like the # HM11140495 with a powered tail light converter to alleviate the strain on your tail...
    view full answer...
  • Parts Needed To Add 7-Way Connector To 2011 Ford E-350 Without Factory Towing Package
    Since your 2011 Ford E-350 does not have the factory towing package you will need to start with adding a 4-way connector. I recommend the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56020 which will plug into your factory wiring and won't require any splicing. With a 4-way connector installed you can now install the # ETBC7 which will give you a 7-way connector and 4-way connector. The # ETBC7 will plug into your newly installed 4-way connector and only...
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  • Recommended 4-Way And 7-Way Wiring For 2006 Ford E-250 Van
    If there is no trailer connector on your 2006 ford E-250 van, I recommend the Curt Custom Fit Vehicle Wiring, part # C56020. This is a quick and easy installation on your van. This plugs directly into your existing wiring and requires no cutting or splicing. I have attached an installation video of this wiring on a 2006 E-250 you can check out. You will then want a 4-way to 7-way like part # 30717. This will attach to the 4-way connector and along with the noted wiring in the attached...
    view full answer...
    Image 1 for
  • Installing 7-Way Trailer Connector on 2005 Ford E-150 Van
    It sounds like you are needing to install a 7-Way connector at the rear of your 2005 Ford E-150. If your Ford Van did not come with the factory tow package (with a 7-way connector), then there will not be a built in socket or harness under the vehicle. If you do not yet have a connector of any type installed, you will want to start with a 4-Way. I recommend the Curt T-Connector Vehicle Wiring Harness # C56020. This is custom-fit for your Ford Van and will install by connecting directly...
    view full answer...
  • Trailer Wiring Harness for a 2012 Ford E-250 Van
    Some 2012 Ford E series vans will have a factory plug and some will not. If your van came with a factory trailer connector then the wiring is already there and active. But if it did not come from the factory with a trailer connector, the factory wiring may be there but it is probably not active. In that case you will need a harness that plugs in line with the van tail light wiring, # C56020, or # 118551. The Curt harness is a non-powered harness while the Tow Ready harness requires a connection...
    view full answer...
  • What Do I Need to Install a Brake Controller on My 2013 Ford E-350 Without Factory Connector
    To add a brake controller to your 2013 Ford E-350 I recommend installing the following: Curt T-Connector 4-Way - # C56020 Universal Wiring Kit - # ETBC7 Extra Wire - # 10-2-1 Mounting Bracket - # 18136 Primus IQ Brake Controller - # TK90160 The Curt wiring gives you the 4-Way that you need and then the additional 2 wiring kits and mounting bracket provide you with all of the wiring for a 7-Way and adding a brake controller. I really like the Primus IQ because it's one of the more budget-friendly...
    view full answer...


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