Shown above are the typical components found in a conventional secondary ignition circuit. Please remember that the spark plug is actually the second gap that must be jumped in a secondary ignition with a conventional cap and rotor ThereÕs a second gap between the cap rotor button and the head of the ignition rotor. If you set your scope to 10 micro seconds per division, you will be able to view both spark events, as shown below. This type of testing can be used to verify internal cap problems caused by a larger than normal rotor air gap. The pattern shown here is normal.