I would put an AC volt meter with peak hold capability and set it at the lowest setting and run the engine and see what happens. If it is OK, then you may be OK but it is beyond what most of us do.
ORIGINAL: 3wExtra
that is correct from one of the servo ports, and yes the powerbox does have leds to let you know about the status of your batteries. i tried it yesterday and it works just fine. the voltage is 5.9 , no EFI, nothing.
is there a reason why a 3w ignition should not be run from a servo port on a powerbox?