When i plug in my garmin to a car charger it

This unit comes with a charger (AC). There is alxo a car charger. Both have a USB connecter that plugs into the side of your unit.

It would appear that the fuse in your charger has blown. Instructions on how to replace it can be found at http://www.garmin.com/garmin/cms/site/us/support/searchsupport

The problem is not the power lead. It's the socket on the back of the satnav. Due to wear when you plug in the mini usb plug it feels as if it's fully in but it's not. Push it in further and it'll work ok.

Make sure your DC & AC charger is a OEM charger.

There is a good chance that there is a bad connection on the mini-USB port.

What happens when you plug the unit into the cradle and NOT use the mini-USB jack?

http://www.sharc.net/gps_charger_repair.htm

- Jim
SHARCNET-USA

When you say 'plugged in', do you mean to the charger or your USB port? If it's the USB port, then that's correct - you cannot access the nuvi from it's screen while it is connected to a PC.

If you are using a wall or in-car charger, see the following link:

http://reviews.gpsfaq.com/downloads/garminnuvi660manual.pdf

See page 10 in the manual, which shows you how to reset your nuvi.

I connected the unit to the car charger instead of the USB charger and then held down the reset for 10-15 seconds, after which the system would show the computer connection on the charger and then boot up when not on the charger.

The solution is really easy. Works in the car or usb charger or whatever.
Once you insert the car charger, wait till the pc connection picture comes.
Than unplug the car charger.
Re-insert it as soon as the picture goes off.
Voila. It is ready to use now!

My recomendation is to use the original accesory for cigarete lighter. I'll give you an example: when I connect my Nuvi 200 to any other USB cable (computer or home charger) its behaviour is like you said - it "says" that is connected to a computer and remains in stand by. But when I connect it to cigarette lighter (but note - the original one) the nuvi 200 recognize it as a car power source and works. The battery symbol disappear from screen and it works perfectly. When I turn off the engine or simply unplug the device from cigarette lighter (not from nuvi !) it recognizez that and ask me if I want tu turn it off on remains on on own battery. If I make no option the nuvi will turn off automatically after some seconds. So it recognize perfectly the car adapter and its behaviour is adapted to a car.

You're still in warranty. Send it back to Garmin.

okay if it charges with your DC, and it gives you plomebs with the AC, i would only charge in the car because your AC charger must not be changing the current to volts and you can easily blow it up... you can buy another charger and that should solve your problem