I repair fitness equipment for a living, but I do not recognize this unit. A pict of the inside will really help. But if I had to guess on how it works would be a 6 Vdc tension motor that pulls some magnets closer to a copper clad flywheel. The tension motor are enclosed in a plastic gear box and most have 5 leads. Three for the position pot (1k?) and two for the motor. The unit will also have a reed switch for rpm sense and 2 wires for the optional external power source. ie wall xfmer. I also could be all wet on this. Hope this helps.