Is it a click?
https://www.f150lightningforum.com/forum/threads/anybody-else-notice-the-slight-click-when-starting-off-either-in-forward-or-reverse.10636/
Here's mine, after the Ford mobile charger stopped working:
https://www.mustartpower.com/products/mustart-level-2-portable-ev-charger-240-volt-25ft-cable-40-amp-electric-vehicle-charger-plug-in-ev-charging-station-with-nema-14-50p-update-version