Garmin GPSMAP 16X3 - NMEA 0183 and Power Cable Pinout

Item Garmin Wire Function Garmin Wire Color NMEA 0183 Device Wire Function
Power Red Power
Power ground Black Power ground
Data ground Black Data ground
Rx/A (In +) Brown Tx/A (Out +)
Rx/B (In -) Violet Tx/B (Out -)
Tx/A (Out +) Blue Rx/A (In +)
Tx/B (Out -) Gray Rx/B (In -)
If the NMEA 0183 device has only one input (receive, Rx) wire (no A, B, +, or -), you must leave the gray wire
unconnected.
If the NMEA 0183 device has only one output (transmit, Tx) wire (no A, B, +, or -), you must connect the violet
wire to ground.
NMEA 0183 and Power Cable Pinout
Pin Number Wire Function Wire Color
NMEA 0183 Tx/A (Out +) Blue
NMEA 0183 Rx/A (In +) Brown
NMEA 0183 Tx/B (Out -) Gray
NMEA 0183 Rx/B (In -) Violet
Alarm Yellow
Accessory on Orange
Ground (shield) Black
VIN Red
15