JOCKs

Hey guys, Just bought an R33 and trying to figure out some problems its having. No constant 12v on the radio loom. I've checked the fuse and its getting power there, but no power at the plug. Its getting ACC 12v volts at the plug though ? I know it has something to do with the headlight reminder buzzer. I've jumped a constant 12v from the hazard switch and the buzzer gets louder. Trying to out what it could be. Does anyone have the electrical wiring diagram or know what it could be ? Thanks