I've had two customer cars with the regular PS8 that have issues, but one of them has (twice now) stopped turning on the amplifiers. It is putting out 2.3V on the turn on output. The amplifier turn on wiring is run on a relay, so it isn't overcurrent. It's really kinda turned me away from wanting to use Arc. Let us know how the PS8Pro holds up. Admittedly, the car in question seems to put out up to 16V from the alternator, so I'm not sure what to do short of using some kind of buck convertor or something to regulate it.
Jay