Interior Lights....

I just bought an 89 Cutlass Supreme SL two door yesturday. I brought it home the lights where off. The car i bought from someone i know it has low miles only 61,000 on the vechile. So they left there cd player in the car and they asked if when i take it out to put mine in they could have back. So i got home frist thing i did was removed the cd player and hooked up all the wires for the new one put it in the vechile. Now the interior lights won't shut off for some reason and you can't leave it like that cause eventually it will train down the battery. Anyone have suggestions or what to look for?!?!?!