This might important for people with positive ground vehicles. Unless my logic is wrong, if you use a conventional analog dwell meter, your dwell measurement will not read correctly. Because the meter is measuring the time that the signal is the same level as the minus side of the battery, your actual dwell is the difference between 90 and what the meter reads. Of course this is assuming your meter doesn't have a setting for positive ground.
Can anyone confirm or dispute this?
measuring dwell angle with positive ground
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