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Yes! The GTM-20 is a charger with a built-in traffic receiver. The charger plugs into the cradle for the Nuvi 660 and then the Nuvi 660 snaps into the cradle.
However to receive traffic with the GTM-20, you will need to purchase a subscription, either yearly or lifetime. The traffic receiver receives traffic information from FM radio broadcast stations, which broadcast traffic data.
Assuming there is power at the cigarette lighter jack - turn the Nuvi off - then connect the charger. It should display charging battery or charging complete. If nothing - does it charge with the wall charger? If so check the fuse in the car charger - it's usually in the tip of the charger which can be turned to get the fuse out.
Make sure the fuse to your DC socket isn't blown. Check the fuse in the tip of the charger. When your Nuvi 660 is plugged into the cradle, you should see a yellow lightning bolt over the battery icon. If you don't see this, then your Nuvi isnt getting voltage from the car charger.
You can also have a bad cradle or charger plug that plugs into the cradle. More info can be found here:
That simply shows that the power adapter/cord is bad. To confirm it, all you need to do is to borrow another charger then plug your garmin nuvi on it to see if it charges, if it charges, then it means what you have to replace is your charger. The former battery is not bad since it can power on and off the gps.
Solution, Get a new charger for your garmin nuvi 660 gps receiver. Am very well convinced that,replacing the charger will do the job.
Hope this piece of information helped.
What happens when you replace the fuse, plug in the charger without plugging the charger into the 660? Does it blow then? If not, the 660 is damaged internally and causing the fuse to blow. If it still blows, then there is a problem in the charger.
I learned that with the unit off - hold the on button down - don't release it. A PRE-BOOT MODE message will appear at the bottom and may flash. Continue holding down the start button. The first time I did it a series of dots came on the screen and I was instructed to touch each one. After that it started as normal. I plugged into a wall charger and but git the pc and nuvi icons again. I repeated the process - holding the on button on and let the PRE-BOOT MODE appear and kept holding but this time a different message came on and then the PRE-BOOT MODE appeared again. I let it go and took the unit to my car and plugged it into the Garmin car charger and it worked as it used to - normal. However, when I plugged it back in the house to the wall charged I got the pc and nuvi icon again. It appears that I am using the wrong wall charger as a previous writes stated. But the nuvi still worked in the car plugged into the nuvi charger. I hope this helps.
It sounds like your battery is defective. They can be replaced. The Motorola phone cable is not wired exactly like the Garmin, and your Nuvi thinks it's connected to a PC. Radio Shack carries a charger for the Nuvi. I have one myself.
Let me know if you need additional help with your battery problem.
Problem solved: I got through to Tech Support. They suggested a 'hard reset', which solved the problem: Put you finger on the lower right screen while you power up and it will do a hard reset---and it will get past the "loading maps" screen, where it had been stuck.