Brief Description: A little rewiring results in AVIONICS ALIVE!
The ZTron switch/breaker that I had running my avionics bus kept faulting. I ran it by the maker of the ZTron and he pointed out I had a lot of load on my bus, at least on startup, since radios tend to draw a lot of momentary power on start up.
So I rewired so that the EFIS and the radios are on separate switches, and viola! Both work now!
Now my problems are with the radio: 1. I don't hear the intercom working 2. The pilot-side microphone jack may be wired wrong, I'm getting a constant "transmit" display on the radio, meaning with the jack plugged in it is in a constant state of transmit; a "stuck mic" situation.