D100 to Gtx 327 wiring

[bmiller269]

I have a question installing a d100 and I'm using the supplied harness. I see that d100 pin 13 goes to gtx 327 pin 19. But where does d100 pin 21 of the twisted pair go to airframe GROUND? just want to make sure I'm going down the right road.
Thanks
Blane

 

[Dynon]

That would work if you have good grounding. More ideal is to ground it to a ground at the transponder.