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What's_nitro?
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Join Date: Apr 2007
Location: Plymouth, MA, USA
04.21.2009, 09:57 PM

A switch is also good for preventing the spark next time you plug in the battery. If you shut it off by the switch before unplugging the battery then the caps remain charged, and voila- no spark! If you shunt the switch then the MMM will always discharge the caps when you remove the battery and so you will always have the biggest spark possible when you plug them in again.
   
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