On Tue, 24 Apr 2018 14:20:55 GMT, Johnny B Good
wrote:

German translations of F for field and
G+ for Generator output terminal and the like will answer your question
any better than what's been arrived at in this thread by the usual
'detective/educated guesswork'. :-)

Anway these translations

Field -- "Feld"
generator -- "Generator"

are unlikely to help:-)

Thomas Prufer