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Adapter 7 Pole to 4 Pole with LED Nite-Glow (TM)

Item # 37335

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37335 - 7 Blade Hopkins Wiring
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37335 - 7 Blade Hopkins Wiring
Wiring 37335 - 7 Blade - Hopkins
37335 - 4 Flat Hopkins Wiring Adapters
Adapter 7 Pole to 4 Pole with LED Nite-Glow (TM) Plug Only 37335
37335 - 4 Flat Hopkins Wiring Adapters


  • Wiring Adapters
  • Single-Function Adapter
  • 7 Blade
  • 4 Flat
  • Plug Only
  • Hopkins
Lowest Prices for the best wiring from Hopkins. Adapter 7 Pole to 4 Pole with LED Nite-Glow (TM) part number 37335 can be ordered online at or call 800-298-8924 for expert service.

  • All Info
  • Reviews (20)
  • Q & A (6)
  • Videos (1)
  • Photos
  • Why etrailer?

Hopkins Wiring - 37335

7-Way to 4-Way Flat Trailer Connector Adapter with LED Nite-Glow

  • Adapter LEDs light up on taillight function.
If your truck has the connector on the left, and your trailer has the connector on the right, you will want this adapter.
30300 18004
Vehicle End Trailer End

Hopkins # 47335, TAP # 37335

Video of Adapter 7 Pole to 4 Pole with LED Nite-Glow (TM)

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

Video Transcript for Hopkins Wiring 37335 Review

Today we're going to be taking a look at part number 78117. This is the Hopkins trailer connector adapter with Nite-Glow LEDs. This is going to convert your 7-way RV style connector to a standard 4-wire flat vehicle end connector. It's going to let you tow a trailer with a 4-way flat plug. That's going to be the plug here on this side. It's going to have a nice dust cap that protects the connection points from any type of rust or corrosion and from the elements.

When it's not in use, you simply just place the dust cap back over top. This system's going to connect the ground, left turn, right turn and stop circuits. Again, it's going to let you tow a trailer with a 4-way flat plug. It will adapt any RV style 7-blade plug. Now this unit is going to be made from a durable corrosion resistant construction. Located on the inside are going to be the Nite-Glow LED system.

That's going to make the connector easier to see at night. The LEDs are going to be activated by your vehicle's tail light circuit. The LEDs are going to appear red because of the red clear housing. We're going to take a measurement of the overall length measuring from edge to edge. It looks like that's going to give us a measurement of about 3-3/4 of an inch. I'm going to go and connect some power to this so you can see what the LED system looks like.

We'll simply just make our connections here. I'm going to turn off the lights so you can get a better view of it since this is for low light settings. You can see there that it sends out a nice consistent signal. The clear lens allows a lot of light to come through so it's going to make the plug easier to see in low light conditions and it can definitely help make the connection a little bit easier to make. That's going to do it for today's review of part number 78117. This is the Hopkins trailer connector adapter with the Nite-Glow LEDs.


Customer Reviews

Adapter 7 Pole to 4 Pole with LED Nite-Glow (TM) - 37335

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

- 37335


Product works as advertised and allows me to plug into my more reliable weather sealed RV plug to power my trailer lights. The only downside is that I will need to get an extension to reach the plugs on some of my trailers. Overall, however, a removable adapter is a good solution to chronically corroded flat four connectors that hang on the back of my truck in tough Upper Michigan winters with heavily salted roads. 524697

- 37335


The product works but I found that when dealing with a difficult truck plug, the black inner part of the adapter likes to push into itself. This seems to be due to the outter red case being too soft and pliable. Needs to be a harder plastic and the use of screw ot two might help keep it in place 403708

- 37335


Havent tried it yet. But looks like a great product at a great value. Thank you for a good online option for retail trailer accessories. I will use you again and let you know how it works out. Thanx george j. 476428

- 37335


I wanted an adapter that was more difficult to lose. Red helps. I wanted an adapter that told me if I had power. it does. I like the cap for the 4 way. 481392

- 37335


Adapter fits great, lights up when plugged in, helped out when I was rewiring the truck trailer harness. 436062

- 37335


Great product, at a great price. I enjoy purchasing from this company because they communicate well. 483639

- 37335


Great product, at a great price. I enjoy purchasing from this company because they communicate well. 483638

- 37335


Perfect! Really helps as I have a trailer for my Avon & a trailer for my Robalo. 307613

- 37335


Haven't got the item yet, but if it's as good as the service, it will be great. 166280

- 37335


Just what I wanted to make it easy to plug in my trailer lights in the dark. 491357

- 37335


Work's great for what I need it for. Awesome delivery time also. 422608

- 37335


Does the job well. Quick order process got it in three days 473104

- 37335


worked as described. etrailer staff is the best 487602

- 37335


The adapter plug works exactly as it sh ould 449172

- 37335


Plugs in, works as advertised. 461453

- 37335


works great light is a bonus 574790

- 37335



- 37335


Great Product. 454115

- 37335


Works great. 301049

- 37335


nice thanks 451198


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

  • 7-Way on Vehicle to 4-Way Trailer Plug Type Adapter for a 2004 GMC Envoy SLT
  • The Adapter 7 Pole to 4 Pole with Tester and Cover, # 47345, will fit your 2004 GMC Envoy SLT, as long as the factory plug is a 7-Way, blade type (and it more than likely is). We also have the Pollak 7 Pole to 4 Pole Connector Adapter, # PK12716. Another option is the Adapter 7 Pole to 4 Pole with LED Nite-Glow (TM), # 37335 (kind of neat as it lights up with the taillights). There are several more. I have included a link below that will take you to them.
    view full answer...

  • Can Two Wiring Adapters Be Used At The Same Time On 1994 Chevrolet Pickup
  • Using the 2 adapters together will give you the connector configuration you started with on your truck. The Adapter 7 Pole to 4 Pole with LED Nite-Glow, part # 37335, plugs into a 7-way connector on the vehicle and gives you a 4-way flat connector for a trailer or other items that has a 4-way trailer connector. Using the second adapter like part # 30717, which is similar to the 47205, would just reverse the first adapter. It would need to plug into a 4-way connector on a vehicle...
    view full answer...

  • No Trailer Lights Using Adapter 7 Pole to 4 Pole # 37335
  • Adapter 7 Pole to 4 Pole # 37335 isn't fused but it is possible that something happened to the wiring on the inside. I recommend taking it apart and inspecting the wiring and fix as needed. Or replace it with a different adapter such as # 78117 if you still want one that lights up. Or for a regular adapter # PK12716 is a popular option.
    view full answer...

  • Is there a 7-Way Adapter that Splits into Two 7-Ways or Should a Junction Box be Used
  • There isn't an adapter that does what you are looking for. I think the junction box idea is the best solution because junction boxes do make things nice and neat and make it easier to troubleshoot. One thing to keep in mind though is to be careful about how much power you are pulling through a set up like that. Most vehicle side wiring and wiring systems are not rated all that high so overloading them is a real possibility. Our most popular junction box is # 38656 but I have also included...
    view full answer...

  • Adapter 7 Pole to 4 Pole with LED Nite-Glow Does Not Light when Plugged Into a 2015 Toyota Tacoma
  • There could be a short or blown tow package fuses on your 2015 Toyota Tacoma causing the 7-Way to 4-Way adapter # 37335 not to light up. To determine if that is the problem you can use a circuit tester such as # ALL640595 to test the connector on the truck without the adapter plugged in. If the pins all have power when they should (head lights on, turn signals engaged, brake pedal pressed) the plug in the adapter and test the pins on the 4-Way side. If there is no power on the 4-Way...
    view full answer...

  • 7-Way to 4-Way Wiring Adapter for a 2008 GMC Pickup
  • Any of the 7 to 4-way adapters we offer will work for you. I'll include links to several of them below.
    view full answer...

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Info for this part was:

Expert Research:
Michael L
Expert Research:
Michael H
Updated by:
Laura H
Expert Research:
Jeffrey L
Photos by:
Sam P

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