What if you criss=cross your wires just below the motor or maybe build a large hardware cloth box (big enough to let the corn pass) around the motor and charge it up. That way wouldn't interfere with the hogs/deer, but if the bear reaches up there it'll light him up.
Regards,
hm
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If My people will humble themselves, pray, seek My face & turn from their wicked ways, I will hear from heaven & will forgive their sin & heal their land. 2 Chron 7:14