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Garmin 18 Pin Data Cable Description This cable is an 18-pin connector to serial pigtail and 12 volt automotive plug, with inline converter circuit. Use this cable for Fleet Management functionality on the StreetPilot c500 series, and Nuvi 600, 700 and 800 series.
Yellow is data out, white is data in, and black is ground. For the Tracker2 OT2m, use yellow - pin 2, white - pin 3, black - pin 5 on a female DB9 connector. For the T2-135, use white - pin 2, yellow - pin 3, black - pin 5 on a male DB9.