If my guess is right the motor will change direction as the line is changed from one side of the cap to the other.
Garage door motor wiring.
The outlet should be labeled as to which of the side screws the white and black wires connect to.
External wiring connects the wall mounted door control and the safety sensor to the motor unit of the garage door opener.
This is the largest piece of the opener and it will be positioned furthest from the garage door.
If the motor is 3 wire reversible ac then the two windings should be equal in resistance.
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Then feed the belt or chain through the end of the rail around the pulley then around the other end at the motor.
Attach the rail to the motor compartment.
Connect one side of the line to common the other side to either end of the capacitor.
That wiring can become damaged or disconnected.
Check that wires are securely attached to the sensor s photoelectric eyes each eye has 2 wires and the wall unit.
Install the pulley at end of rail opposite the motor compartment.
Once the wire is connected to the electrical outlet you can now connect the electric garage door opener to the electrical outlet.