interio and headlights not working

I just bought a 93 grand am ...two of them actually lol ...but in one car the headlights or the interior lights or the radio will not work....i have checked fuses and they are all fine...my guess is its wiring ...maybe somebody did it putting the cd player in i dont really know...just wondering if anyone had advice or might know specifically whats wrong...
signed: studnet in need of help

Welcome jeano20 , try checking all the fuses and relays for the headlights. I hav seen the dash lights die from a bad stereo install though. electrical trouble shooting can be tricky/difficult in finding. I would start the relays/fuse then maybe check the CD player, you might find a loose or bare wire(s). GooD Luck XI