Does the motor run at normal speed? If it is running noticably slower, it will draw more current and blow your fuse, get the wire hot, etc. Check for mechanical obstructions, dirty bearings, etc.
P.S. Sometimes the heater box gets loaded with leaves.
Regards, George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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