The way chargers are designed, a 12A charger does not put out 12A for x hours. If the battery is dead, it usually puts out a little more for a few minutes or so and then comes by the rated number and over time, as the battery voltage builds the current drops off.
So the only way you know your battery is charged is to look at the charging amps. At about 4 my Schumacher 10 a unit goes into the green area indicating full charge; or full enough.
On the alternator, last time I bought a replacement from Autozone, there was a note in the box that said if you don't charge your battery prior to installing this alternator you would void your warranty. Like you realized they are designed for sustaining, not deep cycle charging.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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