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Bench Testing a wiper motor????

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Pugger in to a battery! All kidding aside, serious problems can run all the way to the wiper arm...soo 1) be gentle with the tubing if you removed it because any stress or crimping will cause the cable i.e. the motor either to fail or cut out from the heat build up.. OH! if the tubing is crimped you will need to hunt for another one NO fix... 2) Another potential problem are the gears at the swivel part of the wiper connect.... they can wear to a point of binding also.. Best way to see that all is well is to take a donated cable and insert it up the tube and check for the for mentioned.....and of course greaser up before the final assembly... The motor windings and gears do fail but.... That's the rest of the story as the saying goes
 
As above, best tested without the rack tube and bits attached... just the motor.

I have tested more of the round motors than the early square ones. The later round motors have a constant earth/ground and you connect power to the slow or high speed windings.

I remember something about the early square motors worked the other way... you supplied power and the switch normally provides an earth connection. Dan Masters put some wiper motor wiring schematics online. Take a look at the bottom of the page linked below for information on the early motor wiring.
https://www.vtr.org/maintain/wiper-problem.shtml
 
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