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I'm taking this as you want to send the gps information to your C80 not receive from the C80? If this is the case the brown wire on the garmin is the nmea data out +. The Black wire is considered nmea out neg (-) of the garmin. So hook the garmin brown to the white on the raymarine. Hook the black from the garmin to the green on the raymarine. That means you are outputting lat/long info to the raymarine from the garmin.
If you connect the unit to another unit, that either sends or receives data on the NMEA network, the in/out wires are used to transfer that data. If you do not have any unit for that purpose, you don't need to have them connected anywhere.
Black or ground to chasis, Red to battery if you want it to have power all the time.
To the fuse box to a switched line if you want it to turn off with the bike.
Be sure to have a fuse in line with the power wire to prevent damage to the GPS umit or a fire on the bike.
You need to solder the wire or wires back on the board. There is a red wire and a black wire used to power the backlight. They go to two solder pads on the board that are near each other. You should be able to see where the wire has broken off. If you don't have the equipment or haven't done this before ask a friend.
guys: book says:
PIN 1 (red) 10-40 volts DC
PIN 2 (black) Ground
PIN 3 (blue) NMEA out Shows this goes to Autopilot/NMEA devise and to RXD positive RXD negative goes to ground (black)
PIN 4 (brown) NMEA in Goes to GBR 21 Beacon Receiver to a blue wire, brown wire on thaat devise goes to PIN 3 and the negative goes to ground
PIN 5 (white) no connection
PIN 6 (Green) no connection
PIN 7 (yellow) goes to alarm low Shows going to negative terminal on alarm relay and positive terminal goes to PIN 1 (red)
This is a common problem with 400 and 500 series garmins. The only fix is to take it back and exchange it. There has been a software update to prevent it from happening but once it powers down it's too late for the update. This has been a known problem since they hit the market in May. Any respectable retailer should exchange it with no questions asked, especially if you just bought it.