Put in a new underhood wiring harness last year and after getting the car out of storage, the wipers blow the 20a fuse immediately. I took the motor out and tested it with 12v of current, seems to work fine, but when I hook it up to the wiper arms and harness, it blows. the wiper arms seem to be moving fine, (manually). tested the terminals and they have 12v of current, maybe I need to test amperage? Any ideas??