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.
SOURCE: Ribbon cable for nuvi 660
u can get it at radioshack websites
or u can try this link above
all the gps information for 660 number model
http://gpsinformation.info/nuvi/660/660.html
Garmin support center----tomtom support center
http://www.gpscentral.ca/contactus.htm
SOURCE: Transfer "favorites" from Garmin Nuvi 660 to 765T
I had the same problem. I called Garmin and the lady said if I had the software Map Source or something, that can do the trick, but the funny thing is you have to buy the software with Map Updates, or you get the software when you buy a new unit, and register the unit within 60 days of first satellite reception. Though I searched internet and someone said to copy a certain file/folder or I'd rather just copy the whole GPS folders and that might do the trick. You are right, this is a pain in the rear end.
SOURCE: Nuvi 660 GPS Receiver: The screen froze on the garmin nuvi 660...when i t...
Please see this link for repair info:
http://www.sharc.net/gps_LCD_repair.htm
- Jim
SOURCE: Garmin GTM 25 Charger is
Unscew the Cig lighter plug silver or black tip part, the fuse in located in there, be careful its sping loaded....check fuse should be a 3 A fuse any Radio Shack should have it or auto store
SOURCE: Garmin nuvi / gtm 20 charger not working. I think
If yours has a plastic tip at the silver metal contact, just unscrew the plastic part between the silver ring and the silver tip. Counter clockwise! Fuse should fall out but take cautions not to lose the silver tip part. I you do it can be found at www.gpsnstuff.com
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