Recommended 7-Way and 4-Way Connector for a Vehicle w/a 4-Way Connector Only

Updated 09/07/2026 | Published 09/02/2026

Products Featured in This Question

Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires

(3562)

$118.25

Question:

My vehicle only has a flat 4 pin connector. I want a unit like Hopkins 48474 which has 4 and 7 pin, with a hard wire connection of 7 pins. Is there on like that wired for 4 pin. Or how to wire 4 wires to the 7 pin connections Have the extra 7 pin is a bonus

asked by: Daniel A

Expert Reply:

There sure is Daniel! For a 7-Way Connector that also has a 4-Way built into it, I recommend the Universal Installation Kit for Trailer Brake Controller item # ETBC7.

Appearance and connector layout wise the item # ETBC7 is setup almost the same as the Hopkins 48474. The main exception is that you will be able to plug your 4-way directly into the backside of it. This will transmit your tow vehicle's lighting signals to the 7-Way and 4-Way connector.

I attached a couple of diagrams below so you can see how to get the 7-Way connector fully wired and functional for the Universal Installation Kit item # ETBC7. This will allow you to operate a trailer's brakes as well as the lights.

You will connect the blue wire to the blue wire on a brake controller harness, connect the black wire to the positive post on your vehicle's battery, the white wire to a suitable ground nearby, and the yellow wire to the reverse circuit. This will provide you with the ability to control a trailer's lights, brakes, and also provide you with a 12v power wire for you trailer's battery. This kit includes all the wiring, connectors, and circuit breakers you'll need.

What kind of trailer are you going to be pulling and what vehicle is the new 7-way connector for? Feel free to answer this and throw in any other questions you have, where it says Add Comment.