Posted for Jim Sower <canarder@starband.net>:
The key though, is *failure modes*.  If it is possible for the internal
regulator to fail "closed" the output of the alternator will feed the field and
it will go to capacity (like 20 or 30 or more volts and gawd knows how many amps
until it fries the rectifier diodes (but by that time, all the avionics are
smoking profusely).

Need an over voltage circuit that opens the output cable .... Jim S.