If the charger is current limited (internal circuitry limits output to about 270 ma regardless of terminal voltage) you could simply hook it and it'll work. But be careful if you do this: If left charging too long (ie. weeks) it could slowly boil the battery dry.
OTOH if the charger is NOT current limited it'll supply more than it's rated current when connected to a 6 volt battery. Consequently it'll overheat in very short order.
If this is the case you could again add a series resistance to limit charging current to a little over the self-discharge rate of the 6 volt battery. Without doing any calculations I guess a #194 lamp (12 volt side marker/instrument panel bulb) would be about right - but this is just a quick guess.
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