So, phase, hall, battery and throttle wires all connected...then this 5 pin harness is what plugs in to the BT from controller..... THEN you plug in switch lights and horn
Its basically the interface..its what you plug all the lighs, horn, cruise and on/off switch in to and then from the controller...the below image plugs in to the bluetooth module... Which sits in a chanel rihht above the battery