not sure if anyone here rides bikes but if so I have a Brooks Saddle B67s made in England up for sale 80 bucks shipped priority mail
located in AZ. if you want to check it out in person .
only has 150 miles on it
not rode hard or put away wet even.:D
If is is shorting out and blowing fuses check for a smashed wire either in the dome light area or the switch location. but if the bulb just stays on and then the wd-40 should fix that problem as the guys mentioned above.
Check number 26 fuse I think that was the one, and make sure the fuses are in the right spot too , you have a blown fuse I know I did the same thing once