I have a single motor 44tonner and a cap pack with two wires. The cap pack instructions simply say to connect to the blue and the black wires of the decoder pcb pads, but Soundtrax showed me different pads on my S4. I have read that the 44 Tonner's decoder/PCB isn't by Soundtrax which figures considering the 44tonner doesn't have sound !
I'm also fitting a Digitrax DZ126 as the oem seems to have died.