Sometimes, if the Garmin GPS battery is allowed to fully discharge, it would require charging directly via USB cable connected to a PC or Mac before it would accept a charge for the cigarette lighter again. Try connecting this way for 4 - 8 hours or more before going forward.
Check the cigarette lighter plug in another "known good" lighter socket / vehicle to help rule out a defective socket. A socket without power indicates anything from needing to change a "simple to replace" fuse - or a bigger problem - damaged wiring in the vehicle (if the socket is used to light cigars & cigarettes - vacuum the socket out to remove ash and tobacco that may collect inside). Trying the GPS elsewhere helps eliminate possible problems with the socket. If it doesn't work elsewhere, depending on the plug that goes into the socket, it too may have a built-in fuse. Check the plug for an exposed fuse - or see if the tip unscrews to provide access to a fuse inside. If unsure, the tech Support people at Garmin are a great source for free help.
Lastly, dirt or grime on the "cradle to GPS" connection or "cable to cradle" connection could be causing the failed connection. In short - carefully inspect all points of connection and remove any deposits found.
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