[mshac]

For "one man show" alternator readings, may I suggest you run test leads to the battery from the multimeter that are long enough for you to pass them through the pilot port window, so you can start the engine and take your readings safely from the pilot's seat? You can test the voltage and the AC ripple that DrDave wants to know. Be sure your battery is fully charged before you perform the ripple test (measure AC voltage in a DC circuit). I would perform the tests with both alternators operating, and with each one individually.