Hi Romano,

I love this game and for $100 you got a bargain.  What sort of condition (cosmetically) is it in?

Anyway - over fusing is very bad. 

Whereabouts are you located? (in case you want to sell?!!)

Are all the bumpers locking on or just one?  It may be a switch (left type) that is locking a coil on and causing the fuse to blow.

Do you have a manual for it?  I just had a quick look on IPDB and no schematics in manual there....I've never worked on an FJ so I don't know the board layout.

It may be as simple as a stuck switch or a transistor gone bad.  Depending on what state, you may be able to remove the driver board (if it has one) and send off for repair!