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Yes, the NMEA- output (I think you lefy uot the "-" in your questoin), anyway, the NMEA - or NMEA negative or NMEA ref is hooked to battery supply ground.
Dont forget to program the Garmin to look for 48,000 baud data.
Usually when it says External Power Lost, it has lost the signal between the power cord and the unit (the car was turned off while the unit was plugged into the socket and on or you pulled the plug out while the unit was on). If you are receiving this message and one of the above situations has not occured, you may have a problem with the cord, the fuse or the vehicle's power socket. Under what circumstances are you receiving this message?
It souds like your GPS is bad. It is either a RV16 or a GPK10. If the GPS is about 1 inch in width then it is a RV16. If the GPS is about 3 inches in width then it is a GPK10. Both GPS units are available through SITEX. 727-576-5995 x139
I don't know the answer to this because I am looking for the same thing.This is the answer I got from Si-Tex:
You are going to need a cable, cble-6pf-sit. This cable will plug into your GPS-90, on the other end is bare wires. You are going to wire this into the pc somehow.
(somehow?)That's the part i'm interested in the most!
I ordered the cable can find nothing that shows how to wire it. I assume that it's wired to a db9 serial connector but have no idea what the pinout connections are. If you find out please let me know.