the switch Stuart links is indeed the factory fan switch for 55-59, which will not get red hot, and should have those insulators on the resistance coils - one of the wires is probably ground if it's an original motor - if the resistance gets really red hot you may have a bad motor

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics