@calstu, I also bought an Ebay replacement unit with the same consequences. I pulled all the loom out to the motor and removed all the tape hoping to find a short, none was found. After much head scratching I checked the continuity on the plug on the new wiper and it had a dead short. Consequently I stripped the original, freed off the spindle, cleaned the brushes, the commutator and it now works fine.
I couldn't be bothered to get a refund for the new one, I dare say I'll strip it at some point.
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