Ignition Coil Resistance Check

Externally Mounted Ignition Coil

1. Remove coil connector. Using the low scale, connect ohmmeter leads to coil's battery and "TACH" terminals. See Figure. Resistance should be 0-1 ohm. If not, replace ignition coil.
2. Set ohmmeter to high scale and connect leads to battery terminal and a good ground on coil. See Figure. Resistance reading should be infinity. If not, replace ignition coil.
3. With ohmmeter still set in high range, connect leads to "TACH" terminal and to secondary terminal. See Figure. Resistance should be 6,000-30,000 ohms. If not, replace ignition coil.