Correct on the years from looking at your pictures.-----Is it electric shift ?.----------Look for a model # on this motor.
The metal shavings are likely from the anti-reversing spring.--------That spring will now have to be replaced and properly lubricated.-----------Clean
The rectifier is part of the battery charging system.-----It changes ac power from the stator to dc that can be stored in the battery.-----------------It
So I finally got everything back together yesterday. Took a look at thermostat and it was closed, took it out and cleaned it. Synced the carburetors
The reason I asked about the four light key switch panel is that if you have that you can pull detailed fault codes by shunting the service connector.