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My Vehicle has a 4-Pin Trailer Plug, but Trailer has 7-Pin Trailer Plug  


My brother SVE only has a 4 plug adapter but my trailer is hard wire for a 7 way plug. What adapter do they make to change the 7 way plug over to a 4 wire plug?


Expert Reply:

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part # C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give you trailer light functions. If your trailer has a 7-pin connector, then it likely has electric trailer brakes and an onboard battery.

If you want a fully functioning 7-way trailer socket on his vehicle, then the installation will be a bit more involved, but we have a kit that contains pretty much everything you will need in part # ETBC7. This kit still uses the same adapter I mentioned above and it also comes with the additional wire and hardware you will need. I attached an installation video to show you how a kit like this is installed.

The only component of the towing setup that this kit doesn't include is a brake controller which will be required if you need to use the trailer's brakes. If you want something inexpensive that will get the job done, I recommend picking up the Tekonsha # TK63VR and wire harness # 20127.

expert reply by:
John H



Hey John, If I have a vehicle with a 7 pin connector and trailers with 4 pin connectors, is there a 7 pin and 4 pin combo unit with a mount that allows me to use either the 4 or 7 pin connection (basically converting my 7 pin to both 7 and 4 pin connections at the same spot)? Can't seem to find this anywhere. Thanks.

Etrailer Expert

John H.


@Timothy There are, but the amount of work you might have to put into installing one will depend on what you currently have. If you are comfortable splicing wires, the easiest way to make this change, in my opinion, would be to install part # HM40975-11998. You can simply screw the bracket into the underside of your bumper or somewhere back by the hitch and splice the wires from the pigtail into the wires going into your 7-way. This product comes with a wiring diagram to help you understand which wires are for which signals.

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