Paul_KD7HB:
You do misunderstand, then. The motor only turns one way. The back and forth motion of the wiper is because of the crank mechanism attached to the gear box of the assembly. Do you have the gear mechanism still attached to the motor?
Hi Paul, I had to remove the gear mechanisms in order to take the picture of the inner circuit of the dc motor housing. When assembled they turn the central hole which turns the coil.