On the left side of the tail section there should be a key hole use the ignition key and turn at the same time pulling up on the seat.
Most late GSXR750 have the battery under the front seat.
Under the main seat beside the battery.
It is under the seat. You need to take an Allen wrench take the seat off and you will see it.
Under the seat in the main fuse box!
If you look under the seat you shold see a keyhole. Just insert your key and it comes off with ease.. I had the same problem when I first got my GSXR too lol..
Take the Allen wrench that came in your tool kit and remove the 2 bolts just below the drivers seat (1 on each side). Then you can unscrew the positive and negative terminals on the battery and pull the battery out.
The radiator cap is under the gas tank at the front. There is also a coolant recovery tank located under the passenger seat on the left side.
at the front of the bike, should be factory mounted on the gauge bracket. also there are some fuses under the tail fairing, left side of the seat
Finding parts for older vehicles can be a hassle, but fortunately there are many online stores and forums that offer classifieds for motorcycles such as a 1989 Suzuki Gsxr. Owners can try their luck sourcing out parts from local junkyards as well.
If you are looking for the fusebox in general its located by the battery. Just take your seat off and look by the battery. That's where its located on my 93katana750. Good Luck
The battery is located under your seat
Afraid not I have a 2000 GSXR 750 and it sits very proud. The small tongue like fixing point on the back end of the seat is too short. The retaining bolts on the front are too short they don't reach down enough