I have been looking at the wiring diagrams for my 1997 Skandic WT 500F, and I cannot see how the battery is being charged while the engine is running. One large positive cable goes from the battery to the starter, one large negative cable goes from the battery to the chassis ground, and one red/grn wire goes from the key switch to engage the starter solenoid. I think I may be missing another wire to charge the battery. Any help would be appreciated. I think someone may have worked on this wiring before.