Glad you found the bad connections before they started a fire Gordon. I would run 120 volts directly to the fan to verify that the fan is indeed fried. It could well be that the load from the previous motor burning out caused the meltdown in the power box or it could be that the loose connections and arching caused the meltdown in the power box and caused the original motor to short out.
I suspect that the motor will NOT start with 120 volt power going directly to it. Make sure the 120 volt power is on a circuit breaker so you don't expose more equipment to high current draws.
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