Wiring Diagram for LGB American Steam Tender with Sound

[sfcgadget]

Does anyone have a wiring diagram for a LGB American Tender with Sound (LGB 69232)? I would like to use it as a swapable sound system that I can use with some of my smaller steam engines that are not LGB. I have looked inside and I figure if I have to, I can add magnets and reed switches to a truck. I have some left over from several Phoenix Sound Systems that didn't require them. What I would like to do is wire into the 5 wire harness that is inside the front that would have connected to an LGB engine. The question is what funtion does each of those 5 wires do? Any help would be appretiated. Thanks!