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The only thing I can think of that would destroy three ignitors would be excessive voltage.
A bad alternator/regulator can produce some very high voltage spikes that might not be visible on a voltmeter but would show up on an oscilloscope.
A battery charger or trickle charger shouldn't account for voltage spike ignitor damage since the ignition would be turned off while charging the battery.
Jump starting from a battery charger with a 'booster' mode might cause spikes.
That's all I can think of at the moment...
You don't live under high voltage power lines, do you?
Jim
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