1977 Volkswagen Eurovan Windshield Wipers have stopped

Electrical problem
1977 Volkswagen Eurovan 4 cyl Two Wheel Drive Manual
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Instead of moving when I flip the switch for my wipers they stay still, but there is a whirring sound coming from them. Is this a problem with the fuse, lubrication, motor, or some other type of mechanism, and how do I fix it?

thanks