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

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

Item # 37185
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Wiring 37185 - 7 Blade,4 Flat - Hopkins
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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.
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Hopkins Wiring - 37185

  • Wiring Adapters
  • Multi-Function Adapter
  • 7 Blade
  • 4 Flat
  • Plug and Lead
  • 4 Flat
  • 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.


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.





Note: If you run the hot lead (black wire), you will need a circuit breaker, for example 9510 (sold separately), between the adapter and the battery itself.



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




California residents: click here



Customer Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (420 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:

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



- 37185
by:

Like the products, easy to install. 611154



- 37185
by:

Installed and connected. Used the existing grommets and cut a slit and small hole in the middle to go up through to the inside. If you take the inside grommet out on the back side Above the bumper after removing the carpet you can feed the cable down through both holes and reinstall the grommets. Mounted the ground wire on the drivers side to the metal frame on the drivers side using existing holes for the grounding wires. Used a hole drill bit to drill a hole just large enough to slide the connector in and bolted directly to the bumper not using the L bracket. Connector is flush with the bumper and used the 4 bolts provided. Took overall three hours to do it all. 643474



- 37185
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I have used this trailer hitch and its wiring package without a problem. the last time I pulled a trailer it was heavy enough to slow me down to 35mph when I was going up an on ramp. my last trip was over 300 miles and had no problems 578241



- 37185
by:

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



- 37185
by:

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



- 37185
by:

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



- 37185
by:

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



- 37185
by:

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



- 37185
by:

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



- 37185
by:

This was exactly what I was looking for to add to my 2017 Ford Expedition! It is an easy to install plug-n-play product to convert a factory 4-pin connector to a 4/7-pin connector. I plugged the 4-pin in, connected the brake wire, and grounded it. Ignoring the auxiliary + power cables, everything worked on the first test. The 4-pin connection was given some dielectric and wrapped with electrical tape to keep it sealed from the elements, and the slack was zip tied to secure it. I still need to give it some finishing touches (fill the bracket gap with some black silicone, maybe find the reverse and/or power lines), but it lets me haul my camper! 635819



- 37185
by:

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



- 37185
by:

instructions as well as posted video made installation very easy and the parts themselves are well constructed 647812



- 37185
by:

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



- 37185
by:

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

- 37185
by:

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



- 37185
by:

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



- 37185
by:

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

- 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



- 37185
by:

Awesome!! Top notch products!! Myself and my friends order from here!! 824202



- 37185
by:

2012 Chevrolet Express..Looks and works great! Easy install..2 1/8" hole saw for center, 3/16" drill bit for mounting screws. Thank you etrailer! 815032



- 37185
by:

Perfect for our pop up camper. 807791



- 37185
by:

Installed on my Kia Sedona and very pleased with the product. Installation was fairly easy and one year later everything is working as expected. 809697



- 37185
by:

Product was as described, and easy to assemble. I had to adapt from a 4-pin plug to a 7-pin for my new camper. It resolved the issue of changing an entire wiring harness. There are very limited instructions on hooking additional wires for 12 volt, back-up lights, brake controller, etc. [Online there are] many videos to help with additional steps. 806129



- 37185
by:

Rear tail light trim was challenge getting connectors fed through. Once threw once easy easy plug and play reassemble done. Then feed power line up passenger side frame rail. Just enough wire had 3 inches to spare. 803971


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