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The alternator on my car will continue to charge, once the field is energized, until the engine stops and power is removed from the field. As I don't know if this is damageing in some way, I leave the switch on until my next EO(ff)C. I monitor my battery voltage and tend to leave the alternator on when in stop and go traffic. If on a longish trip, I engage the alternator when my battery voltage gets to 12.0vdc at rest( seems to stay around 12.2 for quite a while). I do charge my battery at night, except when thunder showers are going on). I also turn the alternator on (and injectors off) when engine braking.
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