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vintageveloce:
I agree with all the other respondents. Yes, the wiper motor gets unswitched +12v, and if it becomes stuck in mid wipe, it will just run down the battery (and probably also cook the motor). Yes, the grease in the motor's gearbox turns to concrete over time, and that can slow down its operation.
But, there are other things that can wear out: the motor's brushes will wear over time, and could be your problem. Also, the little brass contacts that operate the self park feature can wear out.
I don't know of any service that rebuilds these motors, though some may exist. You might check the "services" section of Hemmings Motor News.
I also don't know of any wiper motors that will interchange with the type used in early 105's. I can tell you that the motors from later Alfas look similar, but are slightly different (ask me how I know). So, finding a good early 105 ww motor (Duettos and Sprints use the same motor) either on ebay or from APE would be another solution.
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