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i have the exact same problem. my wiper would not move at all. the nut holding the wiper arm to the motor was over-tightened. i loosened it but it will only move if i get out and push the arm. either you over tightened the nut holding the wiper arm on or something is internally stripped inside the wiper motor, like mine.
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2000 Chevy Blazer ZR2
Performance Mods: Numerous
Suspension Mods: Some, but not enough
Exterior Mods: Just Right
1987 Buick Turbo T Dark Red
Low 11 sec sleeper 
.030 4.1 block, PT6262E, & other odds and ends....
My Cardomain
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