My Garmin 580 GPS for over-the-road trucks has failed me after several years of use. It won't stay energized. I plug it in, it's lit for several seconds, then goes black. Anybody ever see this with their GPS, without regard to the maker? I'm wondering if the charger has gone around the u-bend. I have a second charger, albeit not for the same model. The plug on this second charger will fit the 580. Haven't yet tried this oldie from a previous unit I had-- for a four-wheeler. I have so many places marked in my 580 that to have to start putting them in all over again as I go to them could take years and years. Suggestions welcomed...