Personally, I would be very cautious about supplying any power to the G3X if if hasn't been properly configured so not to damage it and void the warranty. I purchase my avionics from SteinAir and I know they bench tested the system with all LRUs connected with their harnesses before shipment.I have a 13 volt 3 amp power supply. Is that sufficient to run the g3x on the bench prior to hooking anything else to it?