Ignition Coil Resistance
- If ignition coil is suspected, connect ohmmeter leads to positive and negative ignition coil primary terminals. Ignition switch should be "OFF" and coil wires removed. Primary resistance should read 1.60-1.79 ohms for Prestolite coils; 1.34-1.55 ohms for Essex coils.
- Then move ohmmeter leads to ignition coil negative terminal and ignition coil tower. Ohmmeter resistance reading should be 9,400-11,700 for Prestolite coils, 9,000-12,200 ohms for Essex coils.
- Replace ignition coil if either specification is not obtained.