If you are blowing the fuse when the circulation blower should kick in, then that blower is most likely bad.
A lot of times when they (blowers) go bad they start drawing more current, so the previous owner probably did the tin foil wrap to circumvent blowing the fuse. Lucky you did not have a fire in the wiring.
I'd put in the right fuse, disconnect the blower and see if it will get past the point where the fuse blew. You could even patch a light bulb in where the blower 'should have' been to see if the process of the blower coming on now works without popping the fuse. If the fuse still pops then you have a short in the wiring (worn insulation to chassis) between the fuse and the blower.
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