The alternator doesn't settle @ 13.8V, the is the resting voltage of a healthy battery, not its charge.
I will say it again, sense wire should be a the Batt+ terminal, not on a amplifier or other load. Placing the sense wire on the output of the alternator is not help with any losses on the cabling between the alternator and the battery (yet to see an OEM lead that is of suitable size cable).
If we were supposed to place the sense wire on the output terminal, you think that all alternators would just omit the sense wire and go back to just two terminals, one output, the other for the alt-fail lamp?
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