I would think an ohm meter test on your installed motor would prove it is not an open circuit. Pull fuse and clip one lead to motor side of fuse holder and disconnect battery for safety. Other lead to ground. Read meter, if infinity then make sure wiper switch is on. If everything is normal then you will read the resistance of motor which is a low resistance.
Just use a battery with jumpers wires to bench test the spare one.
Last edited by beltfed; 09/12/2016 7:56 PM.
