newly purchased used boat.
put 2 fresh marine batteries in.
at dock, idling motor, all instruments within normal operating parameters.
while standing there at console, motor just stops running, and entire console is power dead.
even when turning key to 'on' position; console indicator does not light up.
on console breaker panel, hitting the test lamp, which usually tests all fuses and lights up each, is dead.
no power on console at all except the outdrive trim on the binacle still works.
Where should i look first. I"m dumbfounded.