don't think electronic ignition has anything to do with better charging (if you mean charging the batteries...) you might have confused that with getting a more efficient burning because of a cleaner spark produced by electronic ignition systems; this would give you a cleaner burn at trolling speeds also !

to check if it's done already:
you might look around if there still is a mechanism under the hood that has a little mechanical hammer and flint (1 hammer and 1 flint for each cylinder) that sparks things up for you ! ;D ;D

just kidding of course- but your question just makes me believe this is not a job you would want to do yourself !