Joined: 10 Jul 2008 Posts: 2709 Location: Southern California
Wed Feb 27, 2013 5:13 pm
I've used all kinds of chargers for my nuvi units throughout the years (Garmin and off-brands) and have never had an issue. However, the particular power supply you use may put the nuvi into USB Mass Storage mode depending on how it's wired (the nuvi will think it's connected to a PC). It will still charge, but you won't be able to use the unit while it's connected.
I believe Garmin is required to NOT recommend a non-Garmin charger, just like any other manufacturer would not recommend a non-branded charger.
Based on my experience with other USB gadgets (not nuvis specifically) I think it depends on the cable. A standard USB cable has separate conductors for data and for power. If the device senses the data conductor, even if it's just connected to a charging brick, it goes into mass storage mode. Cables that are made specifically for charging lack the data conductor. Since there's no data terminal on the micro-plug end, the device doesn't go into mass storage mode, it just charges while still doing it's normal thing.
Joined: 28 Feb 2013 Posts: 17 Location: Great Mongeham, Kent, UK
Thu Feb 28, 2013 12:06 pm
Can confirm I use my Nuvi 3790 off a six volt supply on my vintage motorcycle.
Just bought a little 'anyvolt' gizmo that delivers five volts and connected it to the red and black power lines in an old micro-usb lead. It works and charges fine, mount stuck to the speedo glass.
Thus any five volts delivered via a micro-usb to the device mount should work in my view.
Have to say the Nuvi is remarkably resilient, first time I did this the Nuvi fell out of my saddle bag and cartwheeled down the road at about fifty! It still works fine though the corners are a bit scratched.
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