See Figure 1
The ignition coil must be diagnosed separately from the rest of the ignition system. Resistance measurements require the use of an ohmmeter and are taken as follows:
- Primary resistance is measured between the two primary (low voltage) coil terminals, with the coil connector disconnected and the ignition switch off. Primary resistance must be 0.71-0.77- for DuraSpark I, or 0.80-1.60- for DuraSpark II and DuraSpark III. For TFI systems, the primary resistance should be 0.3-1.0-.
- 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 wiring from the coil disconnected. Secondary resistance must be 7,350-8,250- for DuraSpark I, or 7,700-10,500- for DuraSpark II and DuraSpark III. For TFI systems, the secondary resistance should be 8,000-11,500-.
- If resistance tests are all right, 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
See Figures 2, 3 and 4
- Disconnect the battery ground.
- Disconnect the two small and one large wire from the coil.
- Disconnect the condenser connector from the coil, if equipped.
- Unbolt and remove the coil.
- Installation is the reverse of removal.