arrow points where the two prongs should be mounted.


Hi All,
I have an 85 camaro 305 sport and when I installed the wiper motor which worked many years ago (before the car was garaged for 8 years) with both the 2 prong and the 4 prong wiring connectors attached, the blades only move a couple inches.

Then, when I removed the cover I found the blue" cam? thing was broke at the bottom of the plastic post that holds the cam on, which was OK before I reinstalled it (Not then knowing it had to be positioned a certain way), after repainting the motor (ignore the yellow arrow).
I also then discovered I did not transfer the contact prongs from the original motor I had to this one (unknown if it works, but it looked “fresh and has new grease on the plastic gears). When I did attach the 2 "contact prongs" on the cover, NOW, with only the motor connection wires on the bottom of the motor, it moves the 2 inches, BUT, when I then plug in the 4 wire connection on the side, NOTHING happens at all!
1. Can someone maybe explain what may be the problem and
2. what the cover controls, and
3. what the cam does
4. Also, Does anyone know what should work on the wiper if the blue cam thing is missing and I get a new motor (without a new cover as they don't sell new covers)?
thanks for any help you all can provide
confused tom