I have an older consolodation 2-8-0 locomotive and tender #41-530-10 steam engine and the motor quit.   Bachmann no longer carries parts for this locomotive.   Anyone know where i can purchase a motor or the brushes and springs kit for it??

You mentioned a total of 3 wires two of which go to ac power and to a switch to ac.   

However,  My oil tank has 4 wires soldered to the pc board.   One on each post marked AC, a third to one of the AC connections, and a fourth to a small connector with a yellow wire on it.    Playing with all four wires I can only get a weak horn sound from it.   How should I connect the 4 wires??