According to the web it's quite a common problem on the GSXR and is normally related to the rectifier. Check the wiring and connections to and from the rectifier in first instance and check for any obvious exposed wires which maybe causing bad earth. A friend of mine says not to use pattern electrical parts and always go for a genuine OEM rectifier if replacing it. If you know someone with same bike ask if you can swap the rectifier and see if it still blows a fuse..
Hope you get it sorted
Bones
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