P3d v5 and FS-flightcontrol

[PsychloneZA]

Good day

Hopefully, I have found the right place to ask for assistance. I am running Prepar3D v5 with Jeehell FMGS and FS-FlightControl. The issue that I am having is that I cannot get the "Ground Power" in FS-Flightcontrol to activate the "Ext" korry on the overhead in order to use ground power during startup. Is there a setting that I am missing somewhere?

Your assistance with this will be greatly appreciated.