The quest continues. The starter contacts are still in good shape, no corrosion at all. The battery is not draining at all with nothing connected to it; in fact, it has gained .03 volts from when I tested it while connected to the starter. the positive and negative cables each show .1 ohm of resistance, even when I twist and kink them. The posistive terminal on the starter is sufficiently isolated, no resistance between it and the starter body, start switch terminal, or the cable that goes between the solenoid and the pinion/housing on the main body. I found a small dirt clod between the negative cable wire and the starter body, inside the solenoid housing, making contact with both, but I don't think this would cause the problem. SOOOOO, I think I am okay between the battery and starter and I'm going to start working my way from the starter up to the components in the cab. I think I will replace the cables just for good measure, then hook the starter all up again, but with the starter switch connected, and see what happens.
