Availability of Vehicle 4-Way to Trailer 7-Way Adapter

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Question:

I have a car with a 4 pin connector and and RV with a 7 pin connector. Do you have an adapter that I could use to connect my cars 4 pin to my RVs 7 pin? Thank you for any help.

asked by: Joann

0

Expert Reply:

Hey Joann! You can use the Hopkins Plug-In Trailer Connector Adapter - 4-Way Flat to 7-Blade # HM54RV. This will carry the light functions from your vehicles 4-way over to the trailer. Does your trailer have brakes? Keep in mind, this will not allow you to use trailer brakes. If you need to use the brakes then you want to upgrade to a complete 7-way using the # ETBC7 along with a brake controller like # RED52VR.

expert reply by: Robin H

0

Hopkins 4-way to 7-way Adapter
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Robin H.

9/2/2025

Hey Joann, did the Hopkins adapter work for your setup, or did you decide to upgrade to a complete 7-way with a brake controller? I'm curious to know how it turned out, as it could help others with similar needs.

Joann

9/2/2025

@RobinH I didn’t purchase the Hopkins adapter yet. I am looking at the Autowbrake electronic brake controller for the pop up camping trailer I want to purchase and tow with my car. The trailer has a 7 pin connection and my car has a 4 pin. I want to use the Autowbrake controller so that I can use the electric brakes on the trailer even though my car has a 4 pin connection. Everything I read about the wiring of this brake controller to the junction box of the trailer would allow the electric brakes to become engaged following the instructions on the manufacturer’s web site. I would also need the Hopkins adapter to connect my car’s 4 pin harness to the trailer’s 7 pin harness.

Answer 1

Hey Tom. There is no mounting bracket for the Hopkins Plug-In Trailer Connector Adapter item #HM54RV. If you're not needing the brake control functions of the 7-way connector you can use the Buyers Products Trailer Connector Adapter item…

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Answer 2

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Answer 3

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 4

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 5

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 6

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 7

Hi Paul, you’re definitely on the right track here, and I can help you narrow this down with confidence. With your tandem 3,500 lb Dexter axles and 33 inch spacing, both the Dexter EZ Flex part #K71-652-00 and the Lippert Road Armor part #LC53CK are…

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Answer 8

To install a Redarc Tow Pro Liberty in your 2023 Toyota Tacoma Sport you will need the following parts: Redarc Tow-Pro Liberty Brake Controller item #RED24FR Plug-and-Play Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers item #RED99FR…

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Answer 9

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 10

You will have to go with a sliding hitch to allow the trailer to make tight turns. For a trailer 8 feet wide the only bed length that's going to allow 90 degree turns without a slider is a stationary hitch. That being said you have two options.…

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Answer 11

That's a very good question, we tend to be extra cautious and say to use 10 gauge wire because that would be more than enough. When you get into longer trailers that will end up using a lot of wire the heavier gauge wire becomes more necessary.…

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