My Exp TailbeaconX also has a white wire. I plan to ignore it per the Exp manual as it is listed in the Certified manual as optional. So grounding or not is your choice.
excerpt from TailbeaconX certified manual
". Prepare the aircraft wiring for connection.
a. Install a shielded 24AWG twisted pair cable from the cockpit to
the tailBeaconX installation location. This cable is used for
interface control (data). Installations requiring suppression input
should install 3 conductor twisted pair cable. Installations not
requiring suppression input require only 2 conductors."
built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more
Last edited by Ralph Inkster : 09-08-2022 at 02:56 PM.