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Adapter 4-Pole to 5-Pole Trailer Wiring Adapter - Shorter

Adapter 4-Pole to 5-Pole Trailer Wiring Adapter - Shorter

Item # 47515
Our Price: $10.30
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Trailer Wiring
Shipping Weight: 0.16 lbs
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Hopkins Plug and Lead Trailer Wiring - 47515
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Great Prices for the best trailer wiring from Hopkins. Adapter 4-Pole to 5-Pole Trailer Wiring Adapter - Shorter part number 47515 can be ordered online at or call 1-800-940-8924 for expert service.
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Hopkins Trailer Wiring - 47515

  • Wiring Adapters
  • Single-Function Adapter
  • 5 Flat
  • Plug and Lead
  • 4 Flat
  • Hopkins

Trailer wiring adapter that changes the 4-pole flat on your vehicle into a 5-pole flat.

The blue wire gets spliced into the reverse light wire on the vehicle which is easily done with the included quick splice wire connector.

Hopkins # 47515, TAP # 37515

47515 Adapter 4-Pole to 5-Pole Trailer Wiring Adapter - Shorter

California residents: click here

Video of Adapter 4-Pole to 5-Pole Trailer Wiring Adapter - Shorter

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

Video Transcript for Hopkins Trailer Wiring Adapter Installation - 2020 Toyota Corolla

Hey everyone, Shane here with Today I have a 2020 Toyota Corolla, and I'm gonna walk you through how to install the Hopkins 4-Pole to 5-Pole adaptor plug. What this is designed to do, is if you have a 4-pole plug on your vehicle, but your trailer has a 5-pole, this allows you to hook into your 4-pole plug on your vehicle, to give you that 5-pole end, if your trailer has a reverse light circuit. The blue wire coming off is gonna have a bullet connector on it, it's gonna come with the extension to connect to our reverse light circuit in the vehicle. This way your trailer, having that reverse light circuit, will allow anybody behind you, if you're backing up, to see what you're doing. What makes this nice is if we're not pulling a trailer with a 5-pole, we can take this adapter, we can throw it in our glove box, or with our other wiring.

When we're ready to use it, simply plug the two ends together. Take your bullet connector end, plug it in, and that allows you to adapt to a 5-pole plug, which has the reverse light circuit in it. As far as the installation process, pretty simple, straightforward. I will say, the end that connects to the reverse wire on the vehicle most likely will need to be extended, so just keep that in mind. You may want to have a little bit of extra wire handy when installing it.

Other than that, that's the only thing you're doing is connecting the 5-pole to the 4-pole on the vehicle, finding your reverse light circuit, and connecting the wire with the quick splice connector that comes in the kit. Now we've gone over some of the features, let's walk through how to get it installed. Now your installation, we're gonna open the trunk. We're gonna go ahead and remove our floor covering. We're gonna come to our threshold, we're gonna have a push pin fastener here and then one on the other side.

Can either put a pry tool in there, plastic trim panel tool, or if you can get your fingers right back here, they usually pop out pretty easy, that'll keep you from scratching anything. We'll pull each one of those out, and then we'll pop this up and out of the way. Pull up, and then we'll set that aside. On each side of the vehicle, this felt liner, you're gonna have two more fasteners. Take a trim panel tool, get in right behind it.

And we're gonna pop each one of those out, to release the lining. If it makes it easier, right down here on the bottom, you have another one. You can go ahead and remove that one as well. Now the reverse lights are actually in our trunk lid. This wire loom right here, we follow it back, to right here, pull off the wire loom, and we need to test the wires to determine which one we're gonna be using. This gray wire, is actually the one that's gonna give us our reverse light signal. What we're gonna do is we're gonna go ahead and test it again, and show you what to look for. So I'll have somebody in the vehicle, put on the brake, put it in reverse, take it out of reverse, put it in reverse. Now we're gonna take our 4- to 5-pole adapter. We're gonna plug it into our 4-pole plug on our vehicle. I kind of brought this line down like this, right around our 4-pole wiring, so we get to that plug. We're gonna take the other end of our blue cable, we're gonna plug them together. That's gonna tell us the length that we need. Go ahead and remove this. Then we can take this end from here, down into the vehicle. We are probably gonna have to extend it, this cable is not gonna be long enough. I just pulled out some extra wiring and threw a butt connector on it. Now what I'll do is I'll take this here, so that if it's not being used, they could pull the 5-pole plug off and then re-install it, and just plug them together when they need it. And that's where I take our quick splice connector, we're gonna slide it over our wire that we tested. We're gonna take our blue wire, and feed it right up in the end like that. I'm gonna simply take a pair of pliers, and press that center metal tab down. Once you get it crimped down, hold that over like that, take all this, take it back from here, and then re-install our panel. Now we can test out our reverse light circuit. I'll have somebody in the vehicle. And you can see we have our test light, to the reverse light circuit coming out of the 5-pole plug, into our ground. Then we'll test out our 4-pole side, brake lights, running lights, left turn, right turn. Once you've tested everything out, you're ready to go. That's gonna do it for look at and installation on the Hopkins 4-pole to 5-pole, flat trailer connector, on our 2020 Toyota Corolla..

Customer Satisfaction Score:

Customer Reviews

Adapter 4-Pole to 5-Pole Trailer Wiring Adapter - Shorter - 47515

Average Customer Rating:  4.8 out of 5 stars   (207 Customer Reviews)


Super quick delivery and great CS helping me make decision. Love you guys.


I had a 2 inch trailer hitch and 4 pole flat wire harness professionally installed on my 2001 Dodge Ram Pickup. When I bought my boat the trailer was wired for a 5 pole flat harness. Took my truck back to the installer to have the harness exchanged and was told that there was no 5 pole flat harness made for my 2001 truck. I asked about splicing a 5 pole flat harness to the 4 pole flat harness and was told by the installer that they don't do splicing and because the 4 pole harness was already installed I couldn't get a refund. So the search was on to fix this problem. Stumbled upon the etrailer E-commerce site and found what I was looking for. A 4 pole flat to 5 pole flat adapter. The price was right, the service was 5 Star and I received the adapter in 4 days which was perfect. I had time to install it, and get my boat on the water that weekend. Thanks George J. I will be using etrailer for all my trailer needs.

Hopkins S.


Hello Terry, Thank you for purchasing our Wiring Adapter!! Hopkins appreciates your review and picture and looks forward to doing more business with you in the future. Enjoy your time on the water!!


A simple way to hook up your 5pin surge brake trailer to a 4 pin connector. My last one had a pin fail after a few years.


This simple adapter works exactly as intended. The only drawback is if you need to utilize your trailer’s back up lights the process of attaching the extra wire is not easy. Since my trailer doesn’t have back up lights I simply skipped that step. Otherwise it’s truly plug and play.


This adapter operates as expected. No issues.


This is the perfect product for when you already have 4-pole trailer wiring but simply want to add a 5th wire for powering the reverse lockout on surge brake trailers or just the backup lights on a truck bed converted into a trailer. It plugged right into the factory connector on my 2011 Ford Ranger. Only ONE splice was needed: the reverse light wire in the taillight. You also have an additional location for wiring in an aftermarket backup camera IF the vehicle's electrical system allows for the extra current. Only complaint is that it didn't come with its own connector cover, but I was able to get that off of etrailer too!

John M.


Still in use, stays well protected with the connector cover, no problems to date!


I have had nothing but extraordinary service from etrailer. Products are excellent, prices fair, and customer/sales service impeccable. Keep up the good work!


This product is very well made. Instructions are a bit brief, but plenty of info online to get it installed. The reverse wire on my car was too small to work with the splice, but I connected them directly w/ a "T". Worked flawlessly with my trailer. The length of the wire on the adapter allows you to make the connection INSIDE the car which will surely extend the life of the connection. Overall great and simple design.



Still works but seems sporadic at times. Will investigate my hydraulic servo for the brakes to ensure they are locking out as required to reverse.


This item was bought for another individual and has worked out immensely! Kudos to the folks at eTrailer for having exactly what was needed and getting it to us so quickly. I have and will continue to sing their praises for any of your trailring needs!!!

Don M.


This adapter is working perfectly after a year. I still highly recommend etrailer for all your towing needs!!!


The five-to-four harness adapter was exactly what we needed to be able to tow our tent trailer with our car rather than our motorcycle. And it arrived so quickly! Thanks for helping us solve the problem so easily and economically.



Still working great! Thanks again for the perfect solution to our problem.


I purchased this for my 2019 Subaru Outback, but I have not installed it yet because I have not had to pull the trailer that requires that adapter yet. However I did purchase one of these for my Toyota Highlander several years ago, and it worked perfectly. It takes the signal for the reverse light and uses it to deactivate the trailer brakes so that you can back up without physically going out to the trailer and locking out the brakes.


I put this on my 2016 Kia Sorento. Do yourself a favor and watch this instructional video "Hopkins Trailer Wiring Adapter Installation - 2014 GMC Acadia". Another great tip for my application is to buy an extra 20 feet of 16 guage wire. I ran the wire from the tailgate on the inside of the weather stripping and snaked the wire into the utility tray in under the back flip up compartment. When I need to hook up the adapter - I just run it out of the tailgate and hook it up. This keeps the adapter out of the elements when not in use.


This adapter is wonderful! It continues to work like a charm, was easy to install, and the price was right. Needed it for hauling my boat trailer that has hydraulic brakes. It has made it through all kinds of Wisconsin and Minnesota weather on my Jeep Wrangler and will last like any other wiring part that is exposed to the elements. I highly recommend this to anyone looking to adapt 4 pole to 5 pole trailer wiring.


This adapter works great. I didn't know what I was going to do. I have a couple of boats and trailers, some of them have the lock up breaks that need to be plugged in to operate. With this little beauty installed I can now plug in all of my towable vehicles without rewiring for each. I looked at every auto and trailer shop around me for resolution but could not find anything. Thanks etrailer, you made my life a little easier.


Works as advertised. Needed a 5 pole for by boat trailer and this did the job. Had it installed in 30 minutes



A year later and no issues.


Great product! I have a Jeep Wrangler Unlimited that only has a four pole flat connector. I have a boat thats needs a five pole because it has surge brakes. This was the perfect solution. I just had the fifth wire connected to the back up light and plugged this five to four pole adapter that was already on the vehicle. Problem solved. It came quickly. I accidently ordered two and I got a call from Etrailer questioning my order. I thanked them and said I only needed one. They saved me the cost of the second adapter when most companys would have just sent them both- and charged me for two.


Fits good, professional looking installation. I did it myself in the driveway with some help from my wife and a roller jack and some jack stands. Only thing I had to do that I don't think was mentioned in the video was to unhook the tailpipe from the bracket & lower the tailpipe as far as it would go to push the hitch in place to line up with the holes.


Works as promised. Easy to install, easy to use.

Allows me to use my 5-pin Boat Trailer plug with the vehicle's 4-pin set-up.

Adds the extra Reverse Line to turn off trailer brakes when backing up, wouldn't be without it!


been searching for a 4 to 5 flat adapter and yours is perfect. good instructions and follow up was great. I will check with y'all for any future trailer needs.

Michael J.


Between heart attach and broken foot, i have not gotten installed yet.


Just exactly what I needed to deactivate surge brakes on my boat trailer so I can backup. Easy conversation from a 4 pin to 5 pin connection that is neat and clean. This product is made so you can just unplug and use your 4 pin connector with no problem. Price is great and product is good quality. Shipping was fast and packaged well.


Product is exactly what I want, but should include a dust cover. Also, wire that leads from plug is too long, and the tail light wire is too short. Where they connect should be closer to the plug, because the way it is you can't really unplug it from underneath the vehicle.


Put this on an '05 Ford F150. Simple install and took only 5 minutes. Drivers side reverse tail light has two screws on the tailgte side. The hot wire for backup light was brown w/ a red stripe. Unfotunately, my package didn't have the wire splice connector inside as it was suppose to so I used stuff I had at home.

Works like a charm. Very clean looking with no extra wires dangling.

Should get 5 stars but the lack of connector bummed me out and I didn't have time to return it.



I've used this product before with good luck, yet the contacts on the last one I ordered corroded in less than a year, which was disappointing.


This product was everything that is says that it is. Suggestion for hatchback owners, though. See if your reverse lights are in the hatchback or on the fender panels before purchasing this product. If they are in the hatchback, as in the 2014 Escape, then you will need to purchase a longer adapter or additional wiring as the routing of the wires to the closest reverse wire is substantial.


Ordered this to use when I pull my motorcycle tent trailer behind my other vehicles .
The motorcycle is a 5 wire system and my other vehicles are 4 wire. I don't use the blue wire for anything.

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