Hi anyone know how to do this step by step. I have done athearn blue box diesels but this one not sure of. I opened it up and I only see 2 wires one going to the tender where it hooks up to the loco and one to the front lite. and they are black also tender frame and loco are metal. And no back lite and one side of tender wheels look to be metal and that's the right side. Thanks for any help Ron