HELP!! has anyone had this problem?
 

HI all,
I've got an 88Tbird Sport - 5.0 eng - my instr panel lights and rear running lights have gone out. When I turn the headlights on I lose radio display as well. All bulbs, and fuses in the fuse boxare good, have brake lights also. Have replaced headlight and brake light switches but didnt fix problem. Any ideas? Thanks for any input :)