Great question, here's my take which basically agrees with the fine gents below. FYI the voltage sensor circuit is what's used to determine and regulate how much charge is sent to the battery. If the voltage on the alternators big main output stud is the same as on the battery post, it makes no difference where you read it (alternator or battery)
HOWEVER anytime current flows in a non perfect resistive wire there's an I x R Voltage drop so the battery voltage is NOT the exact same as the alternators output BUT UNLESS THE DISTANCE IS GREAT AND/OR THE WIRE IS TOO SMALL AND/OR THERES A BAD CONTACT THERES VERY LITTLE DIFFERENCE which is why it works "about" the same wired to EITHER location. I'm NOT saying how to do it or not do it, I'm ONLY saying absent a long wire or small wire or a bad connection it makes relatively "little" difference.
Obviously if its a ONE wire unit (Big main output stud ONLY, NO other wires leading elsewhere to the exterior) and there are no external voltage sense or excitation circuits you don't need to run a separate voltage sense wire to the battery.
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