Welcome to Justanswer.com, my name is ***** ***** I will do my best to assist you.
You have one of two issues. Either your battery has failed, or your vehicle charger has failed.
Do you have a regular non vehicle charging, usb cord that you could connect to your Nuvi and connect to a computer and see if it will charge?
If it will charge, then your vehicle charger is bad and you can order a low cost replacement here. http://amzn.to/1sBnEVS
If it still wont charge using a different cable, t hen you have a bad battery.. And you can order the battery replacement kit here ( includes the battery, tool needed, and instructional video showing how to replace it )
If you have further questions, let me know.
I strive to provide great service, and greatly appreciate a 5 star rating clicked and submitted when you are satisfied.. I always answer follow up questions.
Senior Technician and Network Switching Systems Operator / Maintainer.