From my youtube viewing, I found out that Triumph has a bad batch of 7.5A fuses. Ones that were installed and ones that were included to use as a spare.
Thus, for a quick fix, it was recommended (again, for a quick fix), to use the included spare 10A fuse instead. Well, until the time you can roll up to an auto store to buy an unaffected 7.5A fuse.
So, if you have a Rocket that is like 3 years old or something, buy new fuses from a good source and replace, just in case.