I have a Nuvi 370. When I plug in the AC charger to charge from the wall. The screen shows the Nuvi with a cord to a box. It does not seem as thought it is charging. It works fine with the car adapter.
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
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Your manual is here. The section on charging states, that green blinking means your battery is fully charged but blinking red means that your charger is faulty. I would say repairable.
1. Plug the female connector of the AC power cord (supplied) to the AC receptacle on the charger and plug in the male connector on the AC power cord into the wall outlet.
2. The On/Off LED indicator is blinking RED, this is abnormal. Unplug AC power cord from the on-board battery charger and wall outlet. Charger may need to be replaced. Contact an Invacare dealer or qualified technician.
3. When the On/Off LED indicator light is Off, charger is Off.
4. When the Charge LED indicator light is YELLOW, the batteries are charging.
5. When the Charge LED indicator light is solid GREEN, the batteries are fully charged (as their condition will allow).
6. When charging is complete, unplug the male connector of the AC power cord from the wall outlet and then unplug the female connector of the AC power cord from the AC receptacle on the charger.
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.
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.
Here is a nice trick to use the Garmin while charging with a USB cord or a wall charger: with the Garmin unplugged keep your finger on the battery icon for about 10 seconds until the diagnostic screen comes up. Then connect the USB cord and press EXIT; the Garmin will reboot and you will be able to use it normally.
Went to Best Buy and they didn't know how to get the bar up either but said that the unit should be charged in 3 to 4 hours. So, when i unplugged the unit from the wall...the battery status showed up. I guess it doesn't show when the unit is plugged into the AC charger. Now, all is well.
Charge the unit over night, Plug in the AC charger and you should see a lightning bolt over the battery bar graph display.
With the charger plugged in, gently press and hold the on/off power until the screen goes black and displays the text "Charging battery". After a few seconds, the screen will go black to conserve power. At any time, you can press the screen and it will light up saying its still charging.
If you let it go over night, when you touch the screen, it will say Charging Complete and you can then remove the charger. You should have full green bars on the battery indicator.
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.