Actually it's common. Just kinda hard to wrap your head around when you first hear about it. And I most likely will attempt to explain it poorly.
If say you need 150 AMPS to crank and engine and power the ignition system with the ignition pulling 10 AMPS. Once the battery pulls down under 150 AMPS available it shorts both the ignition and the starter motor. Say the battery is providing 140 AMPS. With the starter getting 135 instead of 140 you most likely won't even notice it. But with the ignition getting 5 AMPS, 50% of what's needed? Now you have a no start. And different ignition systems can be affected at different levels. 6 volt electronic conversions have a reputation of no start with very small voltage/amperage drops. Points and condenser seem to be more forgiving.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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