The ignition coil is the heart of the 1968 Chevrolet's ignition system. It is the ignition coil that provides the distributor with enough electrical energy to fire each of the engine's spark plugs. An ignition coil is defective if it either produces no spark, or if the spark produced is weak. Testing the 1968 Chevrolet's ignition coil requires checking the coil's primary resistance and its secondary resistance with an ohmmeter.
Tools Used: Ohmmeter
Test Ignition Coil
Attach the two alligator clips from a ohmmeter to the threaded rods located on top of the ignition coil. Some ohmmeters feature metal probes rather than alligator clips, in which case simply press each metal tip against the thread rods.
Note the position of the ohmmeter's needle on the bottom portion of the ohmmeter's scale. The needle should read at approximately 1.0 ohms of resistance. If the value is above this reading, replace the coil. This test check's the coil's primary resistance.
Connect the wire from the ohmmeter to the threaded pole on the top of the coil that the distributor's small wire is attached to, then connect the other ohmmeter wire to the top of the distributor where the spark plug wire attaches to.
Note the position of the ohmmeter's needle on the upper portion of the ohmmeter's scale. The needle should read between 4,000 and 10,000 ohms of resistance. If the value is above 10,000 ohms, replace the coil. This test check's the coil's secondary resistance.
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