Garmin SL40 wiring to Garmin 240 plus GRT servo wiring

[petersb]

Garmin Sl40 manual says, ground shielded cables at both ends, ie: radio end and Audio Panel end.
Garmin 240 Audio Panel says to ground shields at 240 end only !

Comments please.

Also;
GRT Servo serial wires are not shielded or twisted. GRT says no problem, Tru Trac and Dynon both twist their serial wires, anyone have any interfernce problems.

I am thinking of replacing the roll servo serial wires with a shielded cable so I can run them through the same conduit as the LED shielded Nav light wires and unshielded Halogen Landing lights wires.

[BobTurner]

Ground shields only at the audio panel to reduce ground loop noise. Run a dedicated wire inside the shielded cable from "audio lo" out to "audio lo" in.

I have a Trio autopilot; instructions were to use a shielded cable but I used twisted multi-conductor instead, so far no problems. I do run the ground return in that bundle.

So I cannot say how noise-immune the autopilot wires will be if not in a twisted pair.