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Convert a USB power/data to power only

Attached from a battery (4 x AA NiMH - it would be nice to add a 5V regulator) a standard USB power/data cable causes the GARMIN NUVI 205W GPS to go into USB MASS STORAGE MODE (for data transfer) just as if it was attached to a computer. The commercial car charger through the same mini-usb port allows the unit to work in navigate mode. How can I modify the cable so that the NUVI sees it as power only?

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  • jeepsterza May 04, 2009

    I do not have the same, but a similar problem. Obviously not all the many connections in the car-power-connector are power related. Does anybody have a pin-out for the nuvi 710? I'm sure that one could unlock additional integration potential with this cable and (usually very helpful) does not have this one.


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I have found a partial fix for my problem at

This explains why a mini-usb "sees" data/power or just power. It has a different resistor between X and ground - the 4 pin. 200K ohm for data/power and 17.3 or 22K ohm for just power.

OK - where does this resistor "live" in the cable and what do I have to break to get at it to change it OR is there someone out there making a USB to mini-usb power only?

Posted on Feb 09, 2008

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Just put a small piece of tape on the middle two pines on the larger usb side that plugs into the computer. just dont unplug the cable or you will have to put a new piece of tape on again

Posted on May 22, 2013

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