How to test a 3 terminal start switch? Thank you.
Answer Dave, the R1 to R2 terminals are a "momentary" contact circuit, when the knob is pressed or turned, the circuit will "close", when the button is released the circuit will "open". The CT1 terminal to the R2 terminal is the relay coil, when the meter leads are applied to the terminals you should read the resistance of the coil. It doesn't matter whether the switch is in the start or relaxed position.