How To Connect 4-Way Flat Vehicle Connector To 7-Way on Trailer

Question

Question:

I have a 4-flat on my vehicle. I want to connect to 7-round on my trailer. Do you have a cable or a coiled-cable for this? Thanks in advance!

asked by: Bill H

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Expert Reply:

To connect your vehicle that has a 4-Way flat connector to your trailer that has a 7-Way connector, you will need to install a 7-Way on the rear of your vehicle. If you just want or need the tail light functions to operate on your trailer you will just need Adapter 4 Pole to 7 Pole, part # 37185. If you need the complete 7-Way wiring to operate, you will need Brake Controller 7 & 4 Way Installation Kit, part # ETBC7.

The 4-Way on part # ETBC7 will plug into the 4-Way on your vehicle and then you will need to connect the remaining wires. The White wire is the ground and should be connected to the frame of vehicle. The Black wire will be connected to the Black wire inside the duplex cable and ran to front of vehicle and connected to the battery via included 40 amp circuit breaker. The Blue wire will be connected to the White wire inside the duplex cable, and ran to the front of the vehicle and later will be connected to the brake controller. The Purple wire can be connected to the reverse lights if trailer has reverse lights or can be taped off and tied out of the way if not being used.

Installing a 7-Way on your vehicle will allow you to install a brake controller on your vehicle to activate the brakes on the trailer if equipped or for future towing needs. Part # ETBC7, will allow you to have both a 4-Way and 7-Way on the back of your vehicle.

If you need a brake controller, email me back and I would be happy to recommend one. Also if you need a brake controller, let me know the year, make and model of your vehicle as some vehicles use a plug-in harness to install brake controller.

I have linked an FAQ on wiring and on installing part # ETBC7 that you may find as a good reference.

expert reply by: Reno H

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Answer 1

In order to actuate the trailer brakes, you'd need a brake controller installed in the vehicle and a 6 or 7-way trailer connector. A 4 pole flat wiring harness like the #18002 you'd looked at carries 4 circuits- right turn/brake lamp,…

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Answer 2

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 3

In regards to the wiring for your 2023 Hyundai Palisade, you'll need to go with a hardwire harness like the Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector part #C59236. Then, you'll need an adapter, the 4 to…

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Answer 4

According to my research, the Aliner Ranger Trailers did come standard with 10" electric brakes so you will need to install a 7-way trailer connector and a brake controller on your 2007 Toyota RAV4 in order to tow it. For this, you will need…

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Answer 5

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 6

You will need to start with a 4-way on your 1991 Chevy 1500. For that you would want the #18252. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller…

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Answer 7

All of the available trailer wiring harness available for a 2011 Toyota Sienna, including the CURT wiring, #C56106, install by connecting in line with the tail light wiring connectors located behind each of the vehicle tail lights. A power wire…

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Answer 8

On your 2011 Sienna, you will first need a 4-way connector like part #118498. You will then need part #ETBC7 to convert the 4-way to a 4-way and 7-way trailer connector to tow your pop-up with brakes. To use the brake controller like part #90195 in…

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Answer 9

Converters are required when a vehicle has what is called a 3-wire or separate lighting system. These systems will have turn signal circuits that are separate from the brake light circuits. Trailers use a 2-wire or combined system meaning the brake…

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Answer 10

First, I have included some pictures, one showing batteries connected in series and the other of batteries connected in parallel. Typically the black wire is the 12 volt power wire and white is the ground. That is the way it is on the 4 to 7-Way…

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Answer 11

You can trim the appearance panel underneath your 2013 Toyota Sienna and reinstall it when using Draw-Tite trailer hitch #75237. If you choose not to you can just leave it off. I have linked the instructions that mention where to trim. You would not…

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Answer 12

For your 2012 Toyota Sienna Tow Ready wiring harness #118498 will establish the 4-Way like you said. You can use #30717 as a 4 to 7-Way adapter but I recommend #37185 because it will give you both a 7-Way and still retain the 4-Way. The white wire…

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How To Connect 4-Way Flat Vehicle Connector To 7-Way on Trailer

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