I understand your point about current and load, however, my understanding has always been that the voltage from the alternator will fluctuate depending on temperature and load requirements, controlled by clever electronics.
I have the ice system showing present voltage on the screen.
At rest, before engine starts it shows battery voltage, usually around 12.6
If the battery voltage is low, or there is a high load on startup, I get 14.5 volts.
During and after a long run, it typically drops to around 13.7.
Is this not one of the functions of the ECU and canbus?
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