After had the windshield wiper completely disassembled and cleaned, the motor won't work anymore. I bench tested the motor alone connecting +12V over the 2 wires (black and pink/black) and I could see the armature moving as being attracted like a magnet to a side, but not spin. The resistance of the armature commutators is about 1.3 ohm and the shunt/series field wires of the case is 4.2 ohm. Am I doing something wrong? Is there another way to test the motor only? Any help will be very appreciate.