240 lights problem

[PomerJoN]

I recently bought a 1990 240sx and the head lights turn singnals and dash lights all worked but the reverse lights a 3rd brake lights and regular brake lights were not working. then I installed a radio and stereo system, now only the head lights come on thats it. It may be fuses? i dont know but I need a pictures or diagram of the fuse box cause my did,nt come with the cap, so i have no idea what fuse controls what. any help would be great.

[stealth_s13]

im going through the same stuff man...ive got everything working except the brake lights...they dont come on when i press the pedel...check your brakelight bulbs to start...then follow my post about brakelights not working...im in the middle of trying some things so if i get it to work ill let you know what i had to do to get it right