[amsat-bb] Yaesu G-5500 grounding question

[Lizeth Norman]

Hi all!
I want to use the ground conductor that is in both the elevation and
azimuth rotators on pin #3 on the rear connectors.
The plug on the rotator controller is a two prong polarized type.
The upshot of this is that there is no actual connection to earth ground at
the chassis.
Can I just add a grounding lug to the back of the controller and attach it
to earth ground?
The reason this is an issue is that I have installed mast (fiberglass cross
arm, really) mount preamps. My radios are battery powered, hence no real
ground at the end of the coax.
Treading lightly here as there are ogres lurking.
Norm n3ykf