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How To Add a 4-Way Trailer Connector To a 2018 Mercedes-Benz Sprinter 3500


I have attached the pictures of the current connectors. The black rectangular 7foot connector is approximately 4foot from the trailer connector which is the tan 7 pin connector...both are rectangular shape and neither use the round pins? The vehicle is a 2018 Mercedes Sprinter 3500 25foot RV Tiffin. It doesnt appear the connector was ever completely wired... could be after market..I bought it used... Do you have a recommendation for a pigtail that will do the job? My trailer only uses 4 pins....


Expert Reply:

The best option we have to add a 4-way trailer wiring harness to a 2018 Mercedes-Benz Sprinter 3500 is with the T-One Vehicle Wiring Harness part # 118649 which offers direct plug-n-play installation. Unfortunately, I don't recognize the plug you have attached but the above is a great way to bypass all this mess. That said, if you want to be able to use the factory tow package wiring (if equipped) then you'd need to reach out to the dealer.

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expert reply by:
Conner L

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