On my first installation (GPS 12), I used the Garmin to utility outlet
power/PC cable. I cut off the urility plug and wired it directly to power
behind the instrument panel. I spliced together the GPS wires of my VHF
radio and radar and put a DB9 connector on them. I connected the Garmin DB9
to the radio/radar DB9. It's worked well for several years. When I think of
it, I separate the DB9 connectors, wipe a film of dielectric grease on them
and reconnect them.
I emailed Garmin telling them what each of the wires was identifed on on
each piece of equipment and they sent me specific instructions for which
wires to use because it seemed to me that each manufacturer stated things
differently, which confused me.

"slamdance" wrote in message
ups.com...
I have a Garmin 182C that I would like to connect to a new iComm M502.
Which NMEA wires gor to whihc, and what is the easiest method for
making the connections?