Im looking at wiring a collins CDI up to a garmin 430. The install manaul for the garmin says i need shieded pairs from the 430 to the CDI (probably physically located about 2 feet of wire length away). The collins install manual only has a collins nav reviever / cdi hook up and does not use shields. Im a bit of a novice and want to do the job correctly so looking for practicle advice on how this should be configured or what an avionics shop would likely do.
Use some 2 conductor plus shield wire cables. Hook up the two internal wires as shown. Connect the shield braid to ground only at the 430. At the Collins end, cut the shield off 1/2 inch back from the wires, so it cannot short to anything. You can put some heat shrink tubing over the cut if you want it to look nice.