I wired master switched 12V to the 3 fuse block I fabricated yesterday, one each for the Com Radio, Transponder and GPS (4A, 5A, 1A respectively). I then ran 12V from the fuse block to the devices above. Next, I ran ground wires from each device to the Ground block on the back of the panel. I tested each first with a volt meter and then by turning it on. All is good. I will label each fuse later.