Need help with a part. I have the first version on the Williams big boy (o-guage) made in the early 90's. The harness that connects the tender to the engine is faulty. It has 4 wires in the connector from the tender leading to the engine. The reverse unit will cycle but the engine will not move unless the wires are wiggled to a specific spot. Does anyone know where I can purchase a replacement harness. Thank you very much for your assistance
Check the wires at the pins, you may have a loose wire in one of the pins. I am not sure where to buy a new 4 wire harness.
FYI; I have bought a couple of 2 wire harnesses at a model airplane hobby shop to use with my diesel engines for continuous power supply when using 2 powered engines together. The wire harnesses can be rated for 5 amps as usually you won't need that much power under normal running.
Lee F.