Pictures are worth a thousand words. Can you show us:
1. Where black e-unit wire is connected
2. E-unit from the angle showing the 4 wires. Sometimes the colors vs positions vary...
3. 3 e-unit wires connected to the motor.
I have had a bad new e-unit where I had to take it apart and fix finger tension. It is rare though. 2 in a row not likely.