Things are progressing on my panel (re)stack. I've carefully studied Garmin's install manuals for all the equipment I'm putting in. One thing that surprises me is how they depict the grounding of the shield wires on cables that carry RS-232 - they connect one end to the back shell connector and the other end goes to the airframe ground. This flies in the face of every admonishment to avoid ground loops in their manuals. Is avoiding ground loops only important for audio signals (music, headset, and mic connections)? It seems data would be susceptible as well. I'm inclined to follow the manufacturer's advice, of course. Just wanted to ask ..wtf? -Example of grounding one side of the shield wire: -Example of grounding both ends of the shield: (Left side, in this case, goes to the back shell and the right side goes to the airframe ground).