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What is Needed for a 5-Way Flat on Tow Vehicle to Connect to 4-Way Flat on Trailer


In my case my 5th pin is for the brake lights. Is there an adapter that will connect this pin to the turn signal/brake lights on a 4-pin trailer?


Expert Reply:

Typically when a 5-Way connector is on a vehicle, like your 2011 Chevy Cruze, it carries the reverse light circuit. Since this isn't usually needed for towing a trailer you should just be able to plug the 4-Way connector from your trailer into the 5-Way on your Cruze.

In the case that the 5th pin is for the brake lights you can simply install the Roadmaster Converter # RM-732 to combine your brake and turn signals and retain your 5-Way connector. You can use a circuit tester like part # PTW2979 to see what function that 5th pin carries.

If you would like to simply replace your 5-Way connector with a 4-Way then I recommend the T-One # 118508 which plugs in right behind your tail lights (see attached installation video).

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expert reply by:
Jon G

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