what you need to do is find an older charger that is nothing more than a 120 volt to 12 volt transformer and a full wave bridge rectifier, and not all of the other "sensing" junk, if you want to keep it hooked up all the time to the 12 volt system. Yard sales, junk yards, flea markets are a good place to look for the "old school" type of chargers.
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I always did want to play around with this stuff, now I have a chance to do so
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