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Verify this connection; from neg. (–) side of coil, circuit leads to moveable contact point as well as a grounded condenser.
To check primary circuit:
With point contacts closed, there should be NO source voltage at the coil. With points open, there should be source voltage. You can verify this by connecting a test light or multimeter at the neg. coil terminal and rotate the engine or distributor. If no change in voltage when points open/close, it could be a bad condenser.
If above is okay, check for spark:
With ignition ON and points closed, open the points manually (or rotate distributor or engine). This creates the spark at the coil. Test spark at secondary coil wire positioned ~ 1/2" from ground. No spark may indicate the coil is bad.
Hope this helps,
Sherwood
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