Sam, do you have C&H or Falkon ignition? If you cycle the power on and off the C&H should fire and if so thats a pretty good indicator the ignition is working OK. If the C&H fires but not when you turn the prop its a good indicator that the sensor is bad or has a broken wire not making contact. I believe if you ground the white wire it will trigger the C&H to fire. If you have the Falkon you may want to send it to me.

Keith
BME