blowing fuses

2000 GP 3.8 eng keep blowing brake light fuse, any ideas?

If they blow as soon as you put in the new fuse than you can unplug the turn signal switch and see if the fuse continues to blow right away. If it does than there is a short in either the ABS, cruise control, third brake lights. If it doesn't than you have it narrowed down to the turn signal switch, wiring to the rear brake lights, or the rear brake lights themselves.