A bad ground causes problems with a wiper motor

Found a problem with the wipers on my 1990 Dodge Caravan. On occasion, they simply wouldn't work. Verified the juice was being applied to the motor/contact assembly & cleaned the connector. All worked well for a while. When the problem reappeared, pulled the motor assembly apart and verified all contacts were making and clean and the windings had continuity and weren't shorted. Put it together and all well again. When the problem came back I gave up looking for positive voltages and went looking for ground. Sure enough. Since the motor is mounted on rubber cushions, there is a small copper band from the motor housing assembly to the one of the mounting stud. Where this ground connection is riveted to the motor housing had corroded. A small screw and a little No-Ox grease and the problem has been gone.

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