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Messages - TheJearBear

I just purchased a used Nuvi  1490 to see if my Traffic auto charging cable is the issue with my twelve-year-old Nuvi  1490 not charging.  I can hook the unit to my PC and if left attached long enough the unit will work normally for several weeks unless the vehicle is driven for three or four hours.  It will just not work properly unless it is recharged by the PC or a five volt charger capable of 2.4 amps.
Will I be able to transfer my backup data and maps to a replacement unit?
I have replaced the original battery and it seems to charge normally on anything except the car charger.  The unit powers up and down when the car is started or turned off.  I have cleaned the unit power input and both ends of the cable.  My car power supply shows 13.4 volts.  ????