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Yes, I totally agree with how you described alternator function. However, the alternator does not always provide output. It varies with electrical load management (see BCM statement below). I was wrong on using the term "free spin" as this implies the alternator is disconnected or not working. According to Ford PTS manual: The BCM calculates and sends the set value needed for the generator (alternator) charging voltage via the HS-CAN to the PCM. And in turn, the PCM commands charging system output to the generator (alternator). Disabling BMS defaults the PCM charging system output to a set, constant value.