Before you test your parts car wiper motor, I suggest you open it up and inspect it. They pack those old assemblies with grease that is almost solid now after 50+ years. Just cleaning the poor thing out, getting all that nasty old grease out, cleaning the contact points on the switch work in the motor, making sure everything is free to move is all that's necessary most of the time to give you years and years of service. That's all I had to do on my 62 Catalina. The car didn't have a wiper motor when I bought it and I cleaned up a good core and it's perfect. Components were high quality and heavy duty back in those days. That wiper motor had a larger armature than a new Honda starter!
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