Hello Neil, continuing the subject: The new charger GTM 25 worked very well, strangely since the previous I checked on a Garmin Nuvi 1350 device prior to use the Nuvi 2580TV, 1350 functioned normally until then ... stopped for good it was for this reason that every time I added up the traffic, he disappeared to restart the 2580TV also regarding amperage charger is a problem I can solve because develop energy solutions to 2.8Amperes maximum current. Using TMC technology, it is possible to change; Now what concerns the GTM25 it can actually be having problems of lack of power when adapted, I believe that this can happen with the new cable, suggesting believe I set up a new board using the same components of garmin, only increasing slightly amperage of 1A to 2A. Proceeds?