For those that are interested in avoiding your Garmin Nuvi going into PC mode when plugged into a U.S.B +5 volt power supply


U.S.B connector pinout

1 +5V 5 volts DC
2 data not connected / float
3 data not connected / float
X GND connected to pin 4 (GND) with 17.3K ohm resistor
4 GND ground

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