The ignition coil must be diagnosed separately from the rest of the ignition system.
- Primary resistance is measured between the two primary (low voltage) coil terminals, with the coil connector disconnected and the ignition switch OFF . Primary resistance should be 0.3-1.0 ohms.
- On DuraSpark ignitions, the secondary resistance is measured between the BATT and high voltage (secondary) terminals of the ignition coil with the ignition OFF , and the wiring from the coil disconnected. Secondary resistance must be 8,000-11,500 ohms.
- If resistance tests are okay, but the coil is still suspected, test the coil on a coil tester by following the test equipment manufacturer's instructions for a standard coil. If the reading differs from the original test, check for a defective harness.
REMOVAL & INSTALLATION
- Disconnect the battery ground.
- Disconnect the two small and one large wires from the coil.
- Disconnect the condenser connector from the coil, if equipped.
- Unbolt and remove the coil.
- Installation is the reverse of removal.