So, I found the problems. Two separate issues. First the coils on the resistors were touching each other. Idk how in the world that happened. Moved the coils away from each other and the fan runs fine.

The short was coming from a pinched/bare wire from the motor itself. It was shorting on the firewall.

I hoped to get it back together tonight, but noticed alot of air being blown around the metal case the blower motor mounts to. Took it apart to seal and the blower wheel is about to come apart. It didnt look near this bad when I replaced the blower motor some 20 years ago. It is rotten...Went through my parts and I have one other wheel that mice have attacked. So, I guess I'll find another wheel. No biggie as I dont want to take the box back out for another 20 years. LOL.

Thanks everybody for the help.

The reason they touched is the fact that all resistors get very hot. When the wires are hot they flex and if you just happen to hit a rough road the wires can bounce together. The excess currant draw because of the shorted motor makes the wires get super hot and make them almost melt and sag. That is why they are inside the heater box so the air flow across them helps cool them down.