If you eliminated the PTO and still encounter blown fuse, you likely got a short somewhere. Time to break out the meter and start tracing the short starting from the fuse that's blowing. I would be looking for continuity to ground with the fuse out. The key switch could be the culprit, but keep in mind that the key switch grounds the magneto at "off". I doubt the lights could be the problem since it has it's own fuse.
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Two 125's and a 124 all with 42" decks
Plow blade
#2 Cart
QA36 snowthower
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