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It should work with a 20 amp, just not as long. Wipers use a fair amount of current so the factory puts a 30 amp in. Perhaps that particular 20 amp is bad or it blew as soon as you turned the wipers on.

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Q: Why does your wiper windshield motor only work with a 30 amp fuse and not operate with a 20 amp fuse in the car?
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