In the event of high voltage, both of the over-voltage modules could trip (assuming Aux Alt switch is turned on).
Their physical location doesn't matter. Both modules will be monitoring the
same system voltage. If the aircraft battery is lead acid, then I might not
install an over-voltage module in the SD-8 circuit. That small aux alternator
will have trouble maintaining 14 volts with normal loads turned on. Over
voltage from the SD-8 is unlikely.
But if the aircraft battery is lithium, I would protect the battery from over
voltage from both alternators. It is not desired to have the battery disconnect
itself from the aircraft, or worse yet, have it catch on fire.
Last edited by Mich48041 : 04-24-2018 at 11:58 AM.