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Adapter 4-Pole to 7-Pole and 4-Pole

Item # 37185

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hopkins wiring 4 flat 7 blade adapter 4-pole to 7-pole and
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Product Images

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Adapter 4-Pole to 7-Pole and 4-Pole 4 Flat 37185
Hopkins Wiring - 37185
37185 - Plug and Lead Hopkins Wiring Adapters
Wiring 37185 - 4 Flat - Hopkins
Hopkins Plug and Lead Wiring - 37185
Hopkins Wiring Adapters - 37185

In Use/Installed

Hopkins Plug and Lead Wiring - 37185 on 2011 Ford F-150
Adapter 4-Pole to 7-Pole and 4-Pole 4 Flat 37185 on 2011 Ford F-150
Hopkins 7 Blade,4 Flat Wiring - 37185 on 2011 Ford F-150

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Videos


  • Wiring Adapters
  • Multi-Function Adapter
  • 4 Flat
  • 7 Blade
  • 4 Flat
  • Plug and Lead
  • Hopkins
Adapter converts from 4 pole wiring on vehicle to 7-pole round plug and 4-pole flat. Additional wire leads for brake, power and accessory. Lowest Prices for the best wiring from Hopkins. Adapter 4-Pole to 7-Pole and 4-Pole part number 37185 can be ordered online at etrailer.com or call 800-298-8924 for expert service.


  • All Info
  • Reviews (308)
  • Q & A (1459)
  • Videos (35)
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  • Why etrailer?

Hopkins Wiring - 37185

Adapter converts from 4 pole wiring on vehicle to 7-pole round plug and 4-pole flat. Additional wire leads for brake, power and accessory.


Features:

  • Adapter converts from 4-pole wiring on your vehicle to 7-pole round plug and 4-pole flat wiring for trailer side
  • Adds additional wire leads for brakes, power, and accessory wiring
  • Wire functions:
    • White - ground
    • Blue - brake
    • Black - hot lead - 12 volt power supply
    • Purple - auxiliary
  • Mounting bracket included


Specs:

  • Connector measures 3" x 3"
  • Distance between vehicle mounting holes: 2-3/16"
  • 90-Day limited warranty


product detail

Wire Functions:
White: Ground
Blue: Brake
Black: "Hot" Lead - 12V power supply
Purple: Aux. - Reverse Lights etc.







47185B Adapter 4-Pole to 7-Pole and 4-Pole - Hopkins # 47185B, TAP # 37185






Video of Adapter 4-Pole to 7-Pole and 4-Pole


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




Video Transcript for Hopkins Wiring 37185 Review

Today we're going to be reviewing part number 37185. This is an adapter that's going to convert from 4 pole wiring on your vehicle to a 7 pole round plug and 4 pole flat plug. This is from Hopkins Wiring. It's going to provide additional wire leads for your brake, power, and accessory functions. The mounting bracket is included. That's designed to hold the socket up out of the way protecting the wiring and making for easier connections.

The connector itself is going to measure three inches by three inches, and the adapter is designed to plug into your existing 4 pole using this plug here. Then it's going to have 4 more wires that are exposed. Your white wire is going to be the ground wire. It's going to ground to your vehicle. The blue wire would carry the output from a brake controller.

The black wire would run to the vehicle battery to provide power for any trailer mounted accessories requiring twelve volt power. Then the purple wire is typically used to power trailer mounted reverse lights. If you don't need to use the purple wire it can be capped off and bundled up out of the way. All the exposed wires have easy connectors on them, so the black, purple, and blue wires are going to have butt connectors, and then the white wire's going to have a ring terminal. It's going to allow you to easily connect it for a nice, secure ground connection. The connection point here on the back of the socket, that is sealed to be protected against the elements.

The white and purple wires are going to be the longest wires. I do have them already bundled up but I did measure them. The white and purple wires are going to measure thirty-six inches in total length. Again, it's going to come with a mounting bracket and all the necessary hardware to mount the bracket and to get the socket mounted to the bracket. You can see those two little packets of hardware. Here on the front of the connector, for the 7 way round connection, it's going to feature a spring loaded lid.

This cap is going to protect the connections when they're not in use from the elements so it's going to keep any dirt or grime off the connectors. That is spring loaded so it is going to shut automatically when it's not in use. Then right here on the 4 pole, or the 4 way flat, it's going to have a nice little dust cap that fits over the connector. Again, that's just going to protect it from the elements, keeping any dirt, grime, or moisture out of those connection points. That's going to do it for today's review of part number 37185. This is the adapter that converts from 4 pole wiring on your vehicle to 7 pole round plug and 4 pole flat plug from Hopkins Wiring. .


Customer Reviews

Adapter 4-Pole to 7-Pole and 4-Pole - 37185

Average Customer Rating:  4.8 out of 5 stars   (308 Customer Reviews)

Adapter converts from 4 pole wiring on vehicle to 7-pole round plug and 4-pole flat. Additional wire leads for brake, power and accessory.

- 37185

by:


The product itself is very well made. The 4-pin connector is molded into the product and very sturdy. The 7-pin connector is held closed by a spring and has a foam gasket to keep water out. The 4-pin wiring is only about a foot long, and the additional 7-pin wiring is a bit longer. I do not have a brake controller (but do borrow a trailer with the 7-pin wiring), so I removed those wires. I also hard-wired all the connections, so I can't speak to the quality of the 4-pin vehicle connector. The mounting bracket is thin steel, which worked well for me, as I had to bend the mounting plate to make it work for my installation. The paint on the mounting plate appears to be high quality as I bent the plate and banged it around quite a bit during install and did not nick the paint. The plate is drilled so that is can be mounted with the 7-pin hinge facing up, down, left or right. The hardware is zinc coated, so it should hold up well to the weather. I went ahead and replaced it with SS to make sure. I also replaced the standard nuts with SS nylon lock nuts to make sure nothing would back out due to vibration. If you plan on using the supplied hardware, I would strongly suggest Loctite on the mounting nuts. I installed this on a CX-5 with hitch # 87623, wiring adapter # C56011 and hitch cover # I-728. Over all a very clean installation. The connector is completely hidden inside the bumper, but easily accessible. 72768



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After taking my new SUV to the dealer to have it wired to tow my camp trailer, I was told it couldn't be done. They refused to see that the vehicle had the tow package and to help me get the last few critical pieces to tow. I guess they were too busy! So I tried a reputable RV shop that I have worked with before and they quoted me over $400 to custom wire my SUV. I knew there had to be a better option. Looked online and found etrailer. They made it sound easy. I purchased: Tekonsha PowerTrac Electronic Brake Controller (39523), Tekonsha wiring adapter (3035P) and 4 pole to 4 & 7 pole adapter (37185). It all arrived quickly and after following the instructions online and even with average mechanical skills, I was good to go in about one hour. Saved about $300 and whipped it out that fast. Why consider any other option. I am extremely satisfied. 59917



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2018 wrangler unlimited Sport S. Without trailer wiring. Completed installation today. Used a 4 flat along with a 7 pin converter. Works and fit perfectly. Very hot day and work slowly and carefully. Very satisfied . Great folks at etrailer. Great products, great quality and prices. I'm a several time repeat customer and couldn't be more satisfied. 4 pin harness Was a 56407 and the 7 pin adapter was a 37185. 539606



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Product was shipped and arrived sooner than expected. Mounting plate is a little thin and flexes quite a bit but shouldn't impact longevity as long as your careful when inserting plug. Unit is made of high impact plastic and wires are sealed. Don't see any reason why it shouldn't last a few years. 4 way plug didn't fit into my stock 4 way on my truck. I had to remove excess rubber in order to make it fit tight. Not a big issue but one should expect some standardization among 4 way plugs. Ground wire (white) is separate from the 4 way plug. Not sure as to why it was built that way but still functioned well. Regardless of my concerns, item was installed and up and running in about 20 minutes. I would buy again. 133653



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I installed the ETBC7 kit a year ago, and a recent trip wiped the plug off while crossing a stream. This was a perfect replacement for my damaged plug and easy to install. 94452


Comments

It is working fine. No problems.

Ron J - 08/13/2014

6242

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Exactly what I expected it to be and it was delivered very promptly 62287


Comments

Installed easily and has worked well with no problems which is almost surprising as it gets used a lot......

Gary M - 07/01/2014

5231

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The products I received were exactly what I needed. Installed very easily and was high quality. 94373


Comments

The wiring kit is working as I expected it to, excellent.

Ron V - 03/03/2015

9826

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Wow after Charles great advice this was so simple to install, YouTube video was point on and the hardest thing was finding the reverse wire. Thanks so much for a good product and excellent advice, here is the pic after install! 500490



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Installed on a 2010 Ridgeline. Just what I needed at a great price. Install was a breeze. etrailer is the best place to find all the stuff that auto dealers rip you for. Good quality and the customer service is above reproach. 501788



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Seems to be a very good product super far shipping! 68493


Comments

Not at all product has already broken. Need a replacement.

Thomas M - 09/01/2014

6594

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This kit is fine for what it is. It is not designed for those who have no existing wiring in the vehicle. You will need ETBC7 if you want an all included kit that provides added wires and fuses for customers who don’t have trailer break or reverse light wiring already installed. If you don’t need the extra material, this is a great kit to turn a 4 pin into a basic 7 pin connector. Also, be aware, you need to look and see where you want to mount the connector. You may need an addition adaptor plate to mount the bracket to the trailer hitch if you don’t have a good location available. 541243



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I installed this along with a brake controller on my 1997 Nissan Pathfinder earlier this year and it was easy to install and the instructions were nicely detailed. I do have some mechanical skills so I would say you need to have some knowledge of electronics, but if you do some careful planning and study, most people could handle the installation. I toasted my plug on some rocks on my last outing so I purchased this to replace my original one. It's a great product. As always, etrailer is very helpful and their knowledgeable staff make it a pleasure to do business with. 259017



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Just as ordered. Have not wired up but looks simple enough. 114312


Comments

Still doing great.

Paul O - 01/20/2015

8768

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Absolutely Superb Service! On the 23rd of September at 10:10 a.m., I ordered a brake controller and several other items from the etrailer.com website. By 12:16 p.m. of the same day, I received a notification from etrailer that the order had shipped. The complete order arrived at about noon on the 26th. Ordering on the website was easy. All items were described very clearly and pictures were provided for them. The service at etrailer is absolutely superb. I would recommend this company, without hesitation, to anyone needing trailer parts or accessories. 324676



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Item 37815 was easy to install. It took me only about 20 minutes in 20 degree weather--on my back in the driveway to complete including drilling holes for the bracket. I plan on using the trailer tow items to pull a double axle car trailer. Although I am very mechanically inclined, your videos and articles made the job a breeze. Your customer service and e-mail support were also excellent. You have an excellent selection of items that appear to be av ailable with no delay. I would recommend your company to anyone with confidence. 30036



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2008 ford explorer limited. the truck came with a 4blade pin on factory 1 1/4 hitch. i added this round7 way. Look under dash there are a factory brake controller plug under the dash, it does not matter if you have tow package or not, its there. The problem is the brake controller output for brakes and 12volt hot does not go anywhere after the plug under dash. So you still need the output from controller for brakes and 12volt battery wired back to plug. If you have tow package its all there plug and play. 148120



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I recently installed the 4-pole to 7-pole adapter on my 2015 Highlander. My first install worked OK, but I ran into a ground clearance issue using the original mounting location. Etrailer suggested using a 2 1/2" mounting box to relocated the connector. Part number 18156 worked perfectly. 496793



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This has been a great connector. Had it on the truck now about a year. The metal mounting bracket is very flimsy but has held up fine. Have to make sure I hold the assembly when plugging or unplugging. The 4 pole plug on the back/truck side was not a direct fit. Had to cut the plugs off and splice wires. Used this plug for both my 7 pin trailer with brakes and 4 pin utility trailers. It's not as sturdy as a factory installed one but it gets the job done just fine. 433005



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Nice quality adapter harness. I would highly recommend etrailer.com 134651



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Great product fast shipping.. used on 2004 Lincoln navigator. 479026



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Most people are skeptical about ordering online, however, etrailer is a company that has gone above and beyond most. From the intial phone call to the follow up contact. Price was inline with most, packaged arrived as promised along with visual map tracking, and online video made installation a breeze. I bought the hitch and wiring for my Volvo XC90 and would HIGHLY recommend etrailer to anyone! I will definetly use etrailer again in the future 35482



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I got the package a day earlier than the expected delivery date. The products were exactly what I ordered and installed very quickly. I have not tested to see if all of the pins work yet, but I have no reason to expect otherwise. I am very pleased with this transaction. I cannot believe what companies charge for parts and installation when this took me all of 10 minutes, including tidying things up and getting the wires out of the way. 509712



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Hitch arrived in a timely fashion. Installation was a breeze and the fit and finish were perfect. Wiring harness hooked up perfectly. etrailer made the whole process simple. I just ordered another hitch and harness for our new car. 379041


Comments

Thanks for the great review on our Wiring Harness and the picture, Bill P!!! We at Hopkins think that you will be pleased with this product. Looks like your are all set to enjoy camping. If you have any concerns or questions, please get in contact with us. Thank you!

Hopkins C from - 05/11/2017

23759

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After trying to figure out how to hook up our 7 pole cord to the 4 flat on our new Mazda CX5, I called the experts at etrailer. The representative quickly told me about the 37185 adapter which was exactly what we needed! Fantastic customer service, great product, easy to install (just plug in to our existing 4 pole on the car and attach ground wire), works great and still gives us the option of using a 4 pole if we need it. 288448



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Provides a 4 pin and 7 pin connector in one compact package. Rear housing is considerably shorter than most, so it's less likely to interfere with the hitch cross member. Includes a mounting bracket, or works great with Curt C58000 bracket. Only complaint is that the 12V wire is quite short, so a crimp connection needs to made very near the connector. Be sure to seal that connection against corrsion. 458708



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This item was received without instructions. The 4pin is easy enough to plug into any other 4 pin. Once you ground the white lead the brakes and signals work well. I dont know what the blue or purple wires are for, as instructions did not come with this item- wiring diagram either. Black lead I assume is power, to be connected to a hot lead, for internal trailer lights, idk. Otherwise, I am happy. 527702


Comments

The black wire is the power wire it needs to be connected to the positive side of the battery by using a 40 amp circuit breaker. If you are using your reverse trailer lights attach the purple wire coming out of the 7-way connector to the your reverse light wire. The blue wire is for electric brakes its going to go to the output wire on your brake controller. There should be a black wire coming from your brake controller that will connect to the positive side of the battery as well using a 20 or 30 amp circuit breaker. The red wire from the brake controller will connect to the cold side of the brake switch above the brake pedal. The white wire on the brake controller grounds to the negative side of the battery. I have attached help articles to assist you.

-- Heather A - 07/10/2018

40767

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I got the ordered products in a timely manner and the quality is great. Only issue was the sub-harness to connect the F-350 harness to the electric brake controller was ordered correctly, but the incorrect part was sent which delayed installation. Nonetheless the issue was quickly resolved and a correct sub-harness was sent. Appreciate all the support; will definitely order from etrailer again. 221390



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Great product was easy to install. I have an '08 Ford E350 that was not set up for trailer wiring. It did have the brake controller wiring under the dash. If anyone has questions as to how to set this up if be glad to share my experience. I also have the etrailer 4 pin system that tied into this. Once I figured out the wiring it was easy to install looks custome or at least dealer installed. 318205



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Got my part at a reasonable price and installed all in the same day. But what really impressed me was a year ago when I installed my trailer brake controler and my SIlverado was suppose to have a OEM tow package..., wrong answer. It had only had trailer lights. So with the help of etrailer and a few emails and the right parts, I got everything installed and have been impressed ever since. 41317



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One year ago I called etrailer to order parts. The customer service rep was very knowledgeable and helpful. Thank goodness for knowledgeable people. Makes my life easier. I do think etrailer has a good system in place and a desire to excell and be good at what they do. The products still work fine. Thank goodness- since etrailer doesn't do the manufacturing. Thanks etrailer. 474507



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Product was easy to install based on simple instructions. Not sure why two wires were short and those being the ones that had to be connected, and one optional wire was long. I know the plug fits various vehicles but another few cents worth of wire that the customer could discard if not needed would have been easier than splicing them and risking a loose connection. 218750



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Looks like a very well designed and made product. I'm pleased and will use it on my car. However, I expected to get some info re what the pigtails need to be connected to on my car so all my trailer lights and brakes will work. We don't have our trailer yet... we have a Parkliner on order since last April; delivery date 25 October... Wish us luck. Thanks. 105263


Comments

The last photo in the gallery has a diagram of what wires serve what functions. The ETBC7 kit might be better suited for this application. It uses this same 7-Way but adds all the other parts, save for a working 4-Pole, to complete the install.

-- Patrick B - 11/01/2013

2262

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If you have 4-flat and need RV, this is the connector for you. Easy to hook up (unless you need to wire in the brake controller). I needed to convert my Corolla 4-flat to 7-pin RV to match my VW Vanagon and motorcycle trailer with newly installed brakes. I haven't hooked up the brake controller yet on the Corolla but I needed the plug compatibility 'til I do. 217850



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Very nice. I bought 2 of these and they have the mounting bracket and everything. One of them was perfect, the other had the wrong hardware. There are 4 bolts that mount the unit to the bracket, and the head are small so they recess into the 4 holes in the plastic, but I did not get the right ones in one order. That's okay, I can go buy hardware. 9775



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I ordered the wrong Item on fault on your part. You sent me what i ordered. I have since return the item and reordered the item i needed. Thanks to your customer service she help me to order the right part. it came in on the 4th. It looks like it's what needed. Soon as the weather clears up enough I'll install it. Thank for Your help. 177508



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I use this matching unit to replace the broken cover(plug lock) parts & spring on my hard wired connection. It's a good product unless/until the plastic hinge breaks(especially if one backs into something). It's less costly to strip/swap parts than a new plug + rewiring. Just wish they made a metal version, or could get select "parts". 81184



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Just what I needed, but I am not installing it. Just planning on using it when I need to hook up my seven pin plug and then dis-connecting it. But if I wanted to mount it to my car, your video on the Ford Explorer couldn't make it any clearer. Great job. The installation would probably take about as long as it does to watch the video. 34490



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Prior to contacting etrailer, I went to a local trailer place and they said a separate line would need to be run from the cabin back the tailgate. Checked out etrailer and not so. Tech support on the product was very good and the install straight forward just by tapping into existing electrical lines. So far so good. 272481



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The pictures available on this site made choosing and ordering the right items so much more satisfying. I didn't have to worry about the wrong items coming to me and then modifying them to fit my purposes. If I ever need more trailer supplies (which is very likely), I will definitely come back to etrailer.com for my needs. 78690



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This is the second time I have ordered trailer parts from etrailer.com. In both instances the parts were shipped and received in only a few days. Further the website videos were also very helpful in understanding how to get the parts properly installed. I would recommend etrailer for their quality of parts and timeliness. 43722



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This is an easy way to add a 7 pin RV plug to your truck when you only have a factory 4 pin flat connector. My trailer does not have trailer brakes but will be easy to add trailer brakes to my truck in the future buy adding a brake controller and some wiring. I just got this plug so I haven't had time to install it yet. 477979



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I haven't installed chains or boat trailer plug and 7 way cord yet.I would like to say that etrailer's quick shipping is second to none!!I buy a lot of things on line like ebay,but I am really impressed by your U.S map tracking system.Before I bought my items I emailed you to make sure of the fit,Your response was fast. 326755



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The hardest part of this install was trying to figure out where exactly I wanted it installed. I had to drill a couple of mounting holes in my bumper, used a counter sink to make the mounts flush with top of bumper and reinstalled the old vinyl bumper cover to hide the bolts. Looks better than factory installed. 167636



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I received the adapter within a week of ordering. I thought this was fast as it was the holiday week. The adapter is very well made and and looks like it will hold up very good in my north east weather. Thanks for a great product at a great price. I will refer my friends and will be doing business with you again. 167381



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Just what I need to tow an RV trailer. Also has a four flat connector. Very easy to install on the 18136 bracket. 63719



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This product worked great. It hides nicely under the bumper and was extremely easy to install. Installed in less than 10 minutes. I towed my trailer as soon as it was installed and it works great! I will be using this for next few years to haul my outdoor equipment for camping and hunting. Highly recommend it. 481631



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etrailer not only provides you with high quality products. Their staff sets the standard for the expert knowledge and advice they provide. It is very comforting to me that I can contact them and get professional advice that is thorough and understandable. I highly recommend them and respect their service. Mike 486168



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Take about plug'n play. This is it. Plugged into my existing 4 pole receptacal, drilled one small hole in the frame for the ground wire attachment, and mounted the 7 pole receptacle to the hitch. Looks to be a well built unit. Sturdy body, resin sealed in the back, sealed door on the front, and sturdy wires. 420091



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I use these adapters to install 7-way connectors on trucks that have no factory trailer wiring provisions. 106803



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best product I ever purchased for solving problem with wiring up trailer. it only took me about 20 min. and I was done and on the road. everything is all plugin no more splicing wires I would highly recommend this product to anyone. I only wished I had known about etrailer sooner thanks guys ! 528715


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Ask the Experts about this Hopkins Wiring
Do you have a question about this Wiring?


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  • To connect your vehicle that has a 4-Way flat connector to your trailer that has a 7-Way connector, you will need to install a 7-Way on the rear of your vehicle. If you just want or need the tail light functions to operate on your trailer you will just need Adapter 4 Pole to 7 Pole, part # 37185. If you need the complete 7-Way wiring to operate, you will need Brake Controller 7 & 4 Way Installation Kit, part # ETBC7. The 4-Way on part # ETBC7 will plug into the 4-Way on your vehicle...
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  • When connecting two batteries together on an RV trailer you usually connect the batteries in parallel to draw 12 volts from both of the batteries. We have a photo, see photo at right, that shows how to wire the batteries in parallel. Once you have the batteries wired properly in parallel you will need to connect the 12 volt power wire from the trailer 7-Way connector to the positive wire on the first battery. This connection will help maintain the batteries when the vehicle is running,...
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  • How to Wire 12V Battery in Enclosed Trailer to Power Trailer Lights Independent of 7-Way Connection
  • You are correct in your description of how to wire in a new auxiliary battery in your enclosed trailer. You will take the 7-Way's 12V power feed and route this to the positive terminal on the auxiliary battery, and you will ground the second battery to the trailer frame, as you described. You might refer to the linked article on trailer wiring to see the usual wiring configurations on trailer connectors. If you want to protect your vehicle battery from accidental discharge (such as if...
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  • Is Using a Brake Controller Necessary for Towing a Trailer
  • If the trailer is equipped with electric brakes and you want them to actuate, you'll need a brake controller. A brake controller is a fairly small investment that will go a long way to keep you safer when towing. There are two types of controllers, the older time-delayed variety and the newer proportional type. I'd recommend going with a proportional controller like the Tekonsha Primus, part # TK90160. A proportional controller can sense how quickly the tow vehicle is braking, and...
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  • Thank you for sending the photo, it really makes things easier! The connector you show in your photo is not the connector for installing a brake controller. If you look on the firewall behind the emergency brake, you will see a white wiring junction box. The blue female connector that accepts the # 3020-P brake control wiring adapter is located alongside or on top of this junction box, as you can see in the photo I have edited for you. I have also linked you to an install video that...
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  • If your 1999 F-250 Super Duty pickup had a factory 7-Way wiring harness and the, under vehicle connector has not been damaged you could use the Ford Replacement OEM Tow Package Wiring Harness, 7-Way (Super Duty), item # 118243, and if you had a factory 6-Way connector then you could use the Ford Replacement OEM Tow Package Wiring Harness, 6-Way (Super Duty), item # 20029, to replace your pigtail. If you would like to hard wire a new connector to the truck then you will need to use a...
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  • Brake Controller Installation on 2011 Toyota Tundra
  • If your 2011 Tundra has the factory tow package, which includes the factory installed 7-way trailer connector on the rear bumper, it will be equipped with the tow package plug under the dash, as shown in the photo I've edited for you. Some models with the factory 4-pole (or 4-pin) trailer connector will also have the plug under the dash, you'll need to look for a white plug located above and to the left of the emergency brake pedal, above the toe kick. Occasionally, the plug will be located...
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  • Where is Factory Brake Controller Plug Located on 2002 Ford F-250 Super Duty
  • On your 2002 Ford F-250 Super Duty the factory brake controller plug will be located under the dash, near the steering column. You will be looking for a 6-prong gray rectangular plug. The location for the plug should be under the steering column toward the left. I am including a link to a video of a brake controller installation on a 2000 Ford F-250 Super Duty. It will show the brake controller plug and the location. If you have a factory 7-Way connector on your truck, all you will need...
    view full answer...

  • Installation of 7-Way Connector on a 1997 Ford F-350
  • I am including a link to a FAQ page on trailer wiring. It will show the 7-Way trailer connector functions and the 7-Way vehicle connector functions. At the bottom of the page is a chart that will list the wire colors by vehicle manufacturer. This chart is only a guideline because the vehicle manufacturers can change the wire colors over the years. I would recommend to use a circuit tester like the Quickee Tester, part # 3808, and test the wires for function on your 1997 Ford F-350. If...
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  • How to Wire a 7-Way Trailer Connector on a 1994 Chevrolet C/K Pickup
  • To wire a 7-Way trailer connector at the rear of your 1994 Chevy pickup, you will need to start with a working 4-way connector, item # 118315, if your truck is not already equipped with one. You would then use the 4 Pole to 7 Pole and 4 Pole Adapter, item # 37185, and plug in the 4-Way on the truck to provide the stop turn and tail light functions in the adapter. If you do not need the brake control feed wire, 12 volt power wire or backup wire for your trailer you can tie one or all...
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  • How to Install a 7-Way Trailer Connector on a 1998 Dodge Ram for a Brake Controller
  • If your 1998 Dodge Ram did not come with a factory 4 or 7-Way trailer connector, then you will need to first install Tow Ready Custom Fit Vehicle Wiring, # 118329. I have included a link to a video installation and a link to the installation instructions for reference. You would then need to install a 4 and 7 Way Installation Kit, # ETBC7. We have a couple of detailed FAQ articles on this installation which I have linked for you. I have also included a video link showing a typical installation...
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  • Parts Needed to Install 7-Way on 2016 Ford F-150 with 4-Way
  • For your 2016 Ford F-150 if your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. If you do have trailer brakes you would need the # 37185 and the install harness part # 22292. If you check out the install video I attached you will see how the connections would be made. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well...
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  • How to Make a Charge Wire for Flat Towing Vehicle with Tow Vehicle with 4-Way
  • To trickle charge the battery on your vehicle you will need to use a # 37185 to convert the 4-way on your tow vehicle to a 7-way. You will need to route the purple wire of this 7-way to the positive side of your battery on your tow vehicle through a circuit breaker like part # 9510 and 10 gauge wire like part # 10-1-1. Now for an umbilical to go from the 7-way to a 5-way you will want to use the part # HM47075. You will then need to use the part # 47515 to convert the 4-way on your toad...
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  • Brake Controller and 7-Way Trailer Connector For 1995 Chevy C/K 1500
  • As a first step, you would need to select a brake controller. I would recommend the Tekonsha Prodigy P2, part # 90885. The P2 is extremely reliable and easy to use, which makes it one of our all-time best selling brake controllers. Most of the Chevy trucks of that era had a blue and an orange or red wire ran along the frame rail for installing the controller. At the rear of the vehicle, they usually terminate on the end of the drivers side frame rail or above the spare tire. In the engine...
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  • Adding a 7-Way Trailer Connector to a 2010 Ford F-150 with Factory Installed 4-Way Flat Connector
  • To convert the factory 4-Way flat trailer connector on the back of your 2010 Ford F-150, you will need Adapter 4 Pole to 7 Pole and 4 Pole, # 37185. You will plug the factory 4-Way into the back of the adapter and hardwire the remaining 4 wires. The white wire gets grounded to the vehicle frame. The blue wire on the adapter carries the brake controller output voltage, and the black adapter wire carries the 12-volt accessory voltage for any trailer mounted accessories that might need...
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  • Parts Needed for Adding a Charging Circuit for a Trailer Battery while Towing with a 2008 FJ cruiser
  • You have it figured out. You will need an appropriate length of 10 Gauge Wire, item # 10-1-1, and a 40 amp circuit breaker, item # PK54540, to provide 12 volt power to the trailer connector at the rear of your FJ. This will provide a maintenance charge to the trailer battery while towing the trailer. You will not need to make any changes at the fuse block on your vehicle. The 12 Volt power wire connects to the number 4 position inside your 7-way connector, see the photo in the trailer wiring...
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  • Installing a Brake Controller on a 1998 Ford F-150 with Factory 4-Way Trailer Connector
  • If your towing package includes a 4-Flat connector, you will first need to add a 7-Way. For your 1998 Ford F-150, you will need the Ford Replacement OEM Tow Package Wiring Harness, # 118242. Follow the wires from the 4-Flat towards the front of the vehicle until you find a connection point, usually on the driver side between the rear tires and the end of the truck bed. There will be more wires going into the connector then coming out. You will disconnect the factory connection and plug...
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Info for this part was:

Test Fit:
Joe V
Photos by:
Theodore B
Expert Research:
Jackie C
Expert Research:
Michael L
Video Edited:
Zack K
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Sarah L
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Robert G
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Patrick B
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Michael H
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Jeff D
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Reno H
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Video Edited:
Joshua S
Test Fit:
Nicholas E
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Updated by:
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