First off, you can't charge a 6 volt battery to 12 volts. Like everybody else is saying, using a 12 volt charge would continue to force current through the battery after it reached full charge and boil out the electrolyte. It probably doesn't have enough electrolyte left to provide the current necessary to crank the engine, but can provide the relatively small amount of current necessary to run the lights.
Lead acid batteries charge to a constant voltage, set by the chemistry. A lot of float chargers will also boil the battery dry if left connected for long periods of time, hence the need for battery maintainers which cycle the charge voltage. NiCad's and similar batteris charge to a constant current, and can be left on a current limited charger almost indefinitely.
It it were me, I'd chalk it up to experience and buy a new battery. You may get the old one to recover temporarily, but it' not going to last very long anyway.
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Today's Featured Article - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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