Main Ignition Coil

Ignition Coils:

Lucas twin coil ignition system:

1. Switch ignition on and check voltage at positive terminal of main coil C.
2. The main coil voltage should be 12 volts. If voltage is below 11 volts, check wiring from ignition switch G.
3. Disconnect lead from negative terminal of main coil and switch ignition on.
4. Negative terminal voltage should be 12 volts. If voltage is zero, replace main coil.