Cleaned up the unit. It comes apart pretty easily. The lower shroud is plastic and the upper motor shroud is some type of pot metal. The ground and power wires from the motor are in very good shape. The power wire is missing the connector. The wiring harness that came with the unit has been cut up and is missing the resistor wire section and the other end of the connector to the motor unit. The defogger switch assembly is in good shape, it does switch from off to on, on without issues and the contacts are clean. The mounting bracket had rust, so I have stripped the paint and the part is soaking in Krudd Kutter rust remover/converter.
It looks like I will have to build a wiring harness for the defogger. I will try to make it function so that there is a high speed and low speed. I am looking into obtaining automotive resistor wire for applications like this wiring harness.
