If you are lucky there will be printing on the wire giving you a clue to the wire size. Alternators come in different sizes. More current the larger the wire. You can also measure the diameter of the wire (less the wire insulation) and compare with the AWG to diameter chart.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
