Accessory Power Car / DC Charger for Garmin Nuvi 1450LMT , 1350LMT , 1300 and Other Navigation Systems
This charger doesn't work in the Nuvi 780. At least I couldn't get it to work. Plug it in and the GPS tells you to plug to a computer. The GPS end is used for computer hookup. I think you need something Comparable to Garmin 010-10747-03, with a wider plug on the GPS end.