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Hopkins 7-Way RV to 4-Way Flat Trailer Connector Adapter with LED Test Lights

Hopkins 7-Way RV to 4-Way Flat Trailer Connector Adapter with LED Test Lights

Item # HM47340
Our Price: $24.35
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Trailer Wiring
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Shipping Weight: 0.36 lbs
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Quickly convert your 7-way, blade-style connector to a 4-pole flat vehicle-end connector. Integrated LED lights let you easily test connection. Protective braided cable is flexible for additional reach. Lowest Prices for the best trailer wiring from Hopkins. Hopkins 7-Way RV to 4-Way Flat Trailer Connector Adapter with LED Test Lights part number HM47340 can be ordered online at or call 1-833-496-1390 for expert service.
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  • Reviews (20)
  • Q & A (0)
  • Videos (2)
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  • Why etrailer?

Hopkins Trailer Wiring - HM47340

  • Wiring Adapters
  • Single-Function Adapter
  • 4 Flat
  • Plug and Lead
  • 7 Round - Blade
  • Hopkins

Quickly convert your 7-way, blade-style connector to a 4-pole flat vehicle-end connector. Integrated LED lights let you easily test connection. Protective braided cable is flexible for additional reach.


  • Adapter converts your 7-pole, blade-style, vehicle-end connector for use with a 4-way flat connector on your trailer
  • Built-in LED lights provide easy troubleshooting
    • Lights up to verify that the connector is receiving power from your tow vehicle
    • Labeled settings for each trailer function
  • Braided cable provides larger range of motion for more convenient hookup than with standard adapters
    • Durable braided material resists shock
  • Large, easy-pull grip design makes installing and removing the plug effortless
  • Tethered cap protects the 4-pole plug from debris
  • Durable plastic construction
  • Terminal grease packet included


  • Wiring configuration:
    • White: ground (GD)
    • Brown: tailights (TM)
    • Yellow: left turn and brake (LT)
    • Green: right turn and brake (RT)
  • 3-Year warranty

47340 Hopkins Endurance Adapter 7-Way Blade to 4-Way Flat with Tester LED Lights

Installation Details HM47340 Installation instructions

California residents: click here

Video of Hopkins 7-Way RV to 4-Way Flat Trailer Connector Adapter with LED Test Lights

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

Video Transcript for Hopkins 7-Way RV to 4-Way Flat Trailer Connector Adapter Review

Hello neighbors, it's Brad here at etrailer, and today we're taking a look at the Hopkins 7-way to 4-pole adapter with built-in LED test light. Unlike a traditional adapter, this actually has a built-in LED light that lets you know that your signals are on. So right now we have our running lights on and when we run through our turn signals, these will also illuminate, and that's something that's really nice because right then and there, you can see if your connection is working. So whether you've been towing with the same vehicle with a 7-way and you've picked up a trailer that now has a 4-pole, this is gonna allow you to adapt to it and you're gonna be able to hook up all the same, have all your lights work. Or if you have gone from a 4-pole to a vehicle with a 7-pole, this will also allow you to adapt to that as well. So that way you can make the junction between the two.

What I really like about the actual design here is it has a nice pistol grip to it so pulling this plug out, it is very easy. You actually have a grip underneath here. Some of these can kind of be a little bit tough. It also has a nice construction to it, just feels good overall, allows this to be put in place and hold it in place. Now on the back end here, you actually have some nice braided cable and it goes to the tether here with our LED test light with our 4-pole on it.

So you can see, having this tether here is nice because you're able to kind of move this around to gain access to your trailer plug, gives you just a little bit of extra room here. And also what's really nice is the integrated dust cap here. So when you're not using your 4-pole, you can simply cap it up and that's gonna keep any road grime or dust or dirt or debris from getting caked up here. That way, when you're ready to use it, you can simply uncap it and it's gonna be nice and clean, giving you a good connection. So let's go ahead and test it on our trailer now.

So first we're gonna do our running lights, which we saw previous, next I'm gonna do my left turn signal, my right turn signal, and then finally my brakes. Now the great thing is you can also see these on the tester as well, so you know that they are working. And that was a look at the Hopkins 7-way adapter to 4-pole with built in LED test light..

Customer Satisfaction Score:

Customer Reviews

Hopkins 7-Way RV to 4-Way Flat Trailer Connector Adapter with LED Test Lights - HM47340

Average Customer Rating:  4.8 out of 5 stars   (20 Customer Reviews)

Quickly convert your 7-way, blade-style connector to a 4-pole flat vehicle-end connector. Integrated LED lights let you easily test connection. Protective braided cable is flexible for additional reach.


Very well made product.


Works great


etrailer responded and provided me with exactly what I was looking for: A7-way RV adapter to a 4-way Flat Trailer connector. This unit also had an LED Test Light built into the connecter!!


Perfect exactly what I needed . Well maid product


Perfect Fit easy installation great ins tructions


Hopkins products are really good - Rewiring trailers with only Hopkins products. The sheath covering 7 way to 4 flat wiring, seems flimsy and would deteriorate in a short amount of time, leaving exposed wires. The 7 way lights up, as well as the 4 flat, insuring wiring is connecting and properly working. The product I wanted was on back order, which appeared to be more heavy duty, sheath. Customer Service helpful. Received within a few days.


My old truck had a 4 pin harness, my new (to me) truck as a 7 blade so this adapter was the solution. It fits as is should and works perfectly.


Excellent product at a great price. Super fast delivery. E trailer is my go to store for all types of trailer repair and fitting out parts.


Great service!

I received a phone
call when they found the product I ordered would be back ordered and they advised a comparable product be substituted.



Great customer service!



Very Convenient works great



got everything i ordered, awesome 1 stop shop!!





Delivered on time.




See what our Experts say about this Hopkins Trailer Wiring

  • Driver Side Trailer Lights Not Working While Using 7 to 4-Way Adapter
    I would first remove the 7 to 4-way trailer connector adapter that you are using and test the driver turn/stop pin inside the 7-way with a circuit tester. If you get power here then plug the adapter back in and test the driver turn/stop pin inside this. If there is no power inside the driver turn/stop pin on the adapter then this has failed and will need to be replaced for which I recommend the 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket part # HM40975 as opposed to something...
    view full answer...
  • How to Use Light-Up Hitch Cover With 7-Way on 2019 Chevy Tahoe
    You can easily use the Chevy Bowtie LED Lighted Trailer Hitch Cover # RP86530 in the hitch of your 2019 Chevy Tahoe with a 7-way. All you need to do is plug the hitch cover into the 7-Way Flat to 4-Way Round Adapter # HM47340 and plug the adapter into your 7-way and you're done. This will give you a hitch cover that lights up when you turn on your running lights and shines brightly when you step on the brakes. I have added links to video reviews of both the cover and adapter for you...
    view full answer...
    Image 1 for
  • What 7-Pin Wiring Harness Fits My 2008 Nissan Pathfinder with Factory Tow Package?
    The harness that is plugged in behind your kick panel is the factory 4-way. What you need to do is to remove the plug and install the T-One Vehicle Wiring Harness with 7-Way Trailer Connector # 118266 if you do not have any relays installed. If you need the required relays, you need to use just the Replacement Wiring Harness for Tow Ready Nissan Vehicle Wiring Harness # 118267. If you ever need to use a 4-way harness alone, I recommend using the Hopkins 7-Way RV to 4-Way Flat Trailer...
    view full answer...
  • Is The Blue Ox Tail Light Wiring Kit # BLU79FR A Compatible Fit For A 2021 Jeep Gladiator
    Yes, the Blue Ox Tow Bar Wiring Kit # BLU79FR would allow the use of a supplemental braking system and will transfer your motorhome's turning and braking signals through to your 2021 Jeep Gladiator's tail lights. This tail light wiring harness comes with a 4-pole connector to connect to your motorhome, so if your motorhome only has a 7-pole socket you can use the Hopkins 7-Way RV to 4-Way Flat Trailer Connector Adapter with LED Test Lights # HM47340 as an adapter between the two connection...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video by:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee Bradley B
Installed by:
Bradley B
Employee Alexander C
Written by:
Alexander C

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