Chart C-4B Ignition System Check (Remote Coil)

Fig. 028 CHART C-4C IGNITION SYSTEM CHECK (REMOTE COIL):

1. Two wires are checked for spark in case one wire is bad.
2. If spark is present the problem must be distributor cap or rotor.
3. Normally, there should be battery voltage at the + terminal. Low voltage indicates an open circuit or high resistance between the distributor and the coil or ignition switch.
4. Check for shorted module or grounded circuit from the ignition coil to the module.
- The distributor module should be turned "OFF", so normal voltage should be about 12 volts.
- If the module is turned "ON", the voltage would be low, but above 1 volt. This could cause the ignition coil to fail from excessive heat.
- With an open ignition coil primary winding, a small amount of voltage will leak through the module from the "Bat." to the tach terminal.
5. Check for an open module, or circuit to it. 12 volts applied to the module "P" terminal should turn the module "ON" and the voltage should drop to about 7-9 volts.
6. This should turn "OFF" the module and cause a spark. If no spark occurs, the fault is most likely in the ignition coil because most module problems would have been found before this point in the procedure. A module tester could determine which is at fault.