Flash update...now I get what you are saying, you have the molded PC
interface cable from Garmin...So yes,make an RS232 extension, pin 2
would be the data out positive to the terminal strip, pin 5 is ground
to the terminal strip and and pin 3 is the data in to the Garmin from
the PC.via the terminal strip. The radio will connect to pin 2 and 5,
then make up a new DB9 to the PC, wit the same connections, pins 2, 3,
and 9 from the PC to the corresponding terminals on the strip from the
Garmin DB9 pins 2,3, and 9....Took a while for that lightbulb to switch
on..phew..