If you have a good analog volt meter, check the battery voltage while cranking. It should be around 9-10v minimum. If low, have the battery load tested.
Also check between the + terminal of the coil and ground while cranking. It should be close to the battery voltage. Not sure how it does it, but something switches the power from one side of the resistor to the other, or bypasses it all together, been a few years...
Those also had a reputation for ignition switch failures, overheating internally and melting the harness plug. Be sure it always gets good coil voltage when it is in the crank position.
Another problem, if it has an amp meter on the dash, check the terminals. They would get loose, burn, loose good connection. Cause charging problems, low voltage, flickering lights...
How's the starter sounding? Possibly it has some bushing wear, drawing too much amperage, not enough left for the spark.
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