StuckAgainSteve
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Don't worry nobody upset. How does the controller know when the battery is depleted and when it is full unless the battery voltage is being monitored? As the battery voltage falls by being drawn on the field voltage is turned up, as it gets full the field voltage is turned down. How does the controller know to do that? Does it have ESP?
They're all connected to the same bit of wire the voltage drop will be across the board which the regulator on the alternator will try to deal with. No external control is required - or indeed possible within margins of sanity and expense.