Originally Posted by gots_a_sol
I had a cheap Nuvi before the Montana and it wouldn't operate when using just a normal usb cable/cig adapter (just showed the usb picture on the screen). It would only work with the Garmin supplied power cord.
I'm going to assume the Montana is the same.
Pretty sure you're correct with this. The 62s needed a special adaptor as well. You could not run off a generic charger, but you could with the Garmin charger/adaptor or the unit specific one from Powerlet.