Reply To: Mod 3 unit 3: Mechanical timer 1 Home › Ask the Teacher Forums › Advanced Schematics and Troubleshooting › Mod 3 unit 3: Mechanical timer 1 › Reply To: Mod 3 unit 3: Mechanical timer 1 August 1, 2019 at 6:04 pm #12283 Sam BrownKeymaster Here, take a look at this markup. This is showing what the power supply to the motor windings looks like at the moment when the start switch is actuated. See if this helps you figure out what’s going on.