On the pcb board on a HO 2-8-2 Mikado Spectrum Y China  Model#83211 the plug that accepts the wires from the engine to the tender, I need to know where the wires go without opening the locomotive? Beside the plug in the tender, on the board, are LED1,+,-, and L on one side, on the other is R,M1, and M2.  Thks Mike