Question about Garmin Nuvi 660 GPS Receiver

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Won't charge while driving

Recently updated Garmin Nuvi 650 online.
Will charge OK in house, but will not hold charge in car while driving- it drains off home charge, then will keep shutting itself off in the car after the in- home charge is low enough. Tried it in another car and it still did not work, so it seems like it is the plug in for the car that is not taking in power?? Or is it in the part that clips into the back of the unit with it's connectors?? We need this for a trip in the near future. Please advise!

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  • Marsha Hartmann Apr 17, 2009

    Yes, tried same adapter in 2 different cars. I don't see anything on the tip of the adapter that unscrews to chk fuse. It's all one piece. will try suggestion of chking side USB port, and let you know. Thanks !!!

  • Marsha Hartmann Apr 18, 2009

    I looked again at the car adapter-the end that goes into the lighter is all one piece so I can't take it apart to check a fuse. There is no USB port on the side of the unit itself (screen)-only a little round plug in for the inside-the-house-power cord, and a slot that looks like maybe there is a card of some kind in there.

    I am at a loss, unless it has something to do with the metal clips on the piece that hooks the unit to a suction stand . Am I going to have to bit the bullet and buy those pieces?

  • Marsha Hartmann Apr 19, 2009

    Ok, I see what you are talking about on the side of the unit- and we are talking about the same thing-it's a small squarish hole between the head phone jack and the SD card slot----- the squarish hole is where the AC adapter goes to plug into house power......that cord/connecters are fine, and I can charge the unit off house power.

    By the way, my unit is a Garmin Nuvi 6-5!-0 NA, not a 660 ora 350...don't know if that makes a difference in what we're talking about or not...

    In the back center of the unit/screen is a slot-maybe an inch long with little prongs -that is where the clip to hold the unit to a suction stand sits. On the back of THAT clip is a little plug in like connector with the cord to that goes into the lighter supplying power from the car. As explained earlier, the end into the lighter is all one piece, so if there is a fuse in that male end, I cannot see how one would get to it. Hope I clarified this a little better. Thanks!!

    SHARCNET-USA May 11, 2010

    If you have a Nuvi 660, you definitely have a mini-usb port on the side of the unit between the headphone jack and SD card slot.

    Unfortunately, the plug on a 660 cradle is different than the one on a Nuvi 350. Don't you have the AC adapter? If so, plug it into the mini-USB connector and see if the unit will charge.

    - Jim


    SHARCNET-USA May 11, 2010

    When you said you tried it in another car.... do you mean you used the same car adapter? If so, this is an indication that the car adapter is not working or it could be the rear cradle connection. To rule out the rear cradle, pull the plug from the cradle and plug it into the side USB port. If the unit works, then your cradle port in the back of the Nuvi isn't working and the pins may be bent inside.

    If it still doesn't work, then the adapter is bad. There is a fuse in the tip. Also, please see this link:

    If you cant resolve the issue, I can help you with this:

    - Jim



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Sounds like you both have a battery problem. I experienced a similar problem when trying to charge via the USB-cable connected to my computer.
Ended up buying an original charger (expensive) and the charging went smooth.
The car charger should in any case work fine, so probably your battery is not very healthy.

Try holding your finger on the battery symbol for about 10 sec. The unit will then switch to a technical page. There you can observe the battery and charging voltage. When I plug in my computer USB-cable, I read around 4,4V and that is not sufficient for charging my battery.
When connected to the original charger, this voltage rises to about 5V which gives a nice charge. When unplugging charger, the unit displays the battery capacity. If the charging voltage is OK, but battery capacity drops quickly after you unplug charger cable, the battery is probably bad. (Of course you have to charge is for some time) I think around 4V battery voltage give 100% capacity. 3,9V gives about 90% capacity.
This will not solve your problem, but can give you an idea about what is wrong.
Good luck.

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If you can access your memory space, check to be sure its not low on memory. otherwise, you may have to reset it to facory setting or upgrade the firmware.

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