It's a pretty small gauge wire so I wouldn't advise upping the fuse. If you're blowing the 2 amp you could take the gamble for a 3 amp fuse. Anything more, you're better off doing a direct wire to the battery and hooking up a relay attached to that 2amp connector.Within reason a larger fuse could be put in, right? How high would you go? Not that I expect to need it, I only plan on hooking up a small GPS to it.