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Discussion Starter #1 (Edited)
How to check Dual Fire coils (Pre TwinCam):

The ignition coil will need to be unplugged from the wiring harness at the point where the smaller wires connect to the coil. Once those are un-plugged from the coil, use a ohm-meter to test the primary and secondary windings.

To test the primary windings, connect the ohm-meter to the points on the coil where the wiring harness connected to the coil. The primary resistance should be about 3 ohms.

To test the secondary windings in the coil, put one lead from the ohm-meter to each end of the spark plug wire connections. The secondary winding resistance should be about 13,000 ohms.
 
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