Originally Posted by
rapattack
Really don't know what a fuse is sorry. I know the term from replacing fuses in fuse boxes for a home but that is all i know about them.
A fuse is a sacrificial "power" restrictor. If the load(motor, lamps etc) is trying to draw more than the source/wiring is meant to handle the fuse is expected to "blow" before anything else takes damage.
There should be a fuse pretty much first thing between the battery and the rest of the bike, as even reasonably small batteries can be quite nasty if there is a short circuit/bad overload.