Why Does Demco DUO Braking System Need to Wire to Tow Bar Lighting of Vehicle

Question:

HI, As Im installing the rm-155 Roadmaster Tail Light Wiring Kit with Bulbs that is independent from the cars electrical system, so, does it need to be connected to the sm99251 Demco SBS Stay-IN-Play DUO Supplemental Braking system as shown in your video? Im figuring that the RV will control all lights on the back of the Sonic Brake, Turns, Running. If I understand the video correctly, the connection allows the sm99251 to operate the brake lights when applied. Using the rm-155, the RV will perform this function, correct? Thanks,

asked by: Jack M

Helpful Expert Reply:

I attached a wiring diagram that details how the Demco DUO part # SM99251 installs with the tow bar wiring kit you are installing part # RM-155. I also attached an install video for both kits as well. The connections that the DUO makes to the tow bar wiring are to allow it to know when you are applying the tow vehicle brakes basically.

expert reply by: Jameson C