I have read about the 5 pin mini USB cables needed to charge a Garmin GPS. I have also seen the 'hard wire' kits to install such a mini USB charger directly to your motorcycle's battery. I do most of my adventuring on a 1978 Yamaha XT500. This is a 6 volt bike. I do NOT want to convert it to 12v. Will one of the 'hard wire' charger kits work on a 6 volt bike? I know they all have a little box that reduces the juice form 12v to 5v... but will this still work with 6v input? Or, is there any other way to charge my GPS on the bike? I only get about 3 hrs of battery life... and thats just not enough for long rides.