I decided to make an Avionics Ground Bus from a 25 pin DSUB solder connector. I soldered a 14AWG ground wire between the full length of the two rows of solder pin connections. The 14AWG was a tight fit between the two rows and soldered up nicely. Fabricated a mounting bracket from an unused 063 angle included with my VPX box. Added an Adel clamp to the bracket to tightly secure the main ground wire. All my avionics ground wires were crimped to male DSUB pins and inserted to the mating connector. The bus bracket also uses 4-40 nut plates so I can screw the mated DSUB connectors together for a permanenet mount. The only wire I did not add was a heavier(18AWG) power wire from the GTN750 COM. That was grounded directly to the firewall forest of tabs -- the same ultimate location for the 14AWG Avionics Ground Bus wire. I like it. So far, it has 11 wires in it, including some serial grounds.
14AWG wire soldered to all DSUB sockets and secured with Adel clamp.
Fits under center stack brace, Nutplates lock it down.
Sitting in place on co-pilot side of center stack brace. Wires still being added. Cushioning coming.
