What Is The Purple Wire Used For On The Brake Controller 7 & 4 Way Installation Kit # ETBC7

Updated 05/24/2010 | Published 05/22/2010

Question:

What is the purple wire used for on item ETBC7 and where is it connected to? Most of the videos show that it is not connected to anything. Thank you.

asked by: Oth S

Expert Reply:

The purple wire on the adapter included with the Brake Controller 7 & 4 Way Installation Kit, # ETBC7, is an auxiliary wire and can be used as a 12 volt power source, to power a reverse light or reverse lockout function for trailer brakes if needed. This wire can be tied up if it is not used, which is why you often see it left unused in our installation videos.

You can see some helpful wiring diagrams at the link provided, as well as a video showing the purple wire on the 4-Way to 7 and 4-Way adapter from the # ETBC7 kit being installed on a Ford truck to power trailer back up lights.

expert reply by: Jeff D