Recommended Adapter to Connect 7-Way Round Pin to 4-Flat Connector

Updated 08/21/2017 | Published 08/19/2017

Question:

7 pin round to flat 3 brake lights dont work Will the 7 round to flat 4, with connecting to a semi trailer to a flat four solve this problem

asked by: Keith

Expert Reply:

The Tow Ready 7-Pole Round Pin to 4-Flat Adapter # 47405 referenced in your question is designed to adapt a 7-way round pin to a 4-flat connector that you can hookup to a trailer that has a 4-way. If this is what your trailer uses, and your existing 7-Way round has the traditional pins as depicted below, then this will work great.

I am not positive how you were connecting the harnesses before, so I can't be sure as to why the brake lights were not working. This adapter will provide an easy solution for connecting the two harnesses.

expert reply by: Chris R