Add a ground wire to the side of the wipermotor on the side with no rubber mounts.
I had that happen to my 98 chevy blazer so I did some research on the internet. its either the wiper motor or the pulse board( an electronic circuit board in the wiper motor) in the motor the new wiper motors are about 80.00 at advance and the pulse boards are about 30.00 if the wipers come on sometimes it is the pulse board.If they don't come on at all it's the motor.(which comes with the pulse board inside already) hope this helps.
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