I don't know if this diagram is like your motor but it says "blocked spindle" 11.2 amps. Since it's blowing a 20 amp fuse, it sure looks like a bad motor.
If you do a search for New Port Engineering (newportwipers.com), you can "Google Map" the address (see attached picture). I'm definitely not against Free Enterprise but I would expect the wiper motor this business uses comes from company across the ocean. If you search for information on Ongaro you may find Alibaba.com which is a Chinese exporter of various items sold to the USA.
This motor may cost $39, for example, but you have to buy 100 of them to get 1.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
