Heated Grips

[Fazerjon]

I've got a 1999 FZS600 and I need to fit my oxford heated grips, but dont want to wire them straight off the battery as they can be switched on without the ignition being on. If  I wire them to the switched side of the main ignition switch so that they only work with the ignition on, will the main fuse be ok to protect the circuit or do I need an additional fuse? :rolleyes