brake light stays on when bike is off

[grego]

hi all i'm a new biker. i just bought a 2006 gz250 with 162 miles on it. after the bike was delivered it sat in the garage until all the paperwork was completed about 2 weeks. i installed a mini rack on the back to carry my laptop. when i went to start the bike the battery was dead. i chargered the battery and the bike started. i checked all the lights and went for a short first time ride. when i got back and turned the bike off the tail light was still on.i believe its the brake light because when i hit the brakes it doesn't get brighter. i read other posts and i don't think i have a park. just off on and lock from what i can see. well i started to troubleshoot the problem. i disconnected the 2 wires from the front brake. i could here the switch clicking. light still on. i chased the rear brake to 2 wires and disconnected them. still on. the only way to turn the light off is either remove the 20 amp fuse or disconnect the battery. any and all help would be greatly appreciated
grego