1 – A properly wired 12 volt alternator will NOT overcharge the battery. If it does it's either wired wrong or (long shot...) the alternator voltage regulator is bad. A quick test is stick a voltmeter across the battery terminals with the engine running at governed RPM. If the voltmeter reads between 13.5 and 14.5 volts the charging system is working fine.
2 – From the behavior of your battery (uses water, cranks slow, trickle charger runs continuously) it has reached the end of its life. Time for a new battery!
3 – Good chance leaving the trickle charger on the battery over the winter hastened its demise. Unless the charger is properly calibrated and temperature compensated (and the cheap ones are not) it will continually overcharge battery and slowly boil the life out of it. Better to simply let the battery sit over the winter and then once every 2 – 3 months put a charger on it overnite to top it back up.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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