The number 7 fuse on my 84 300 D keeps blowing out. that is the one that controls all the lighting, inluding all the window and airconditioning buttons as well the instr cluster. anyone have any ideas on what it could be. if it is a short any ideas on where to start looking. aslo i recently changed my radio and i just kept the brown wire that used to provide light to the radio(and is linked to the fues well) insulated but disconnected. can this have any effect on the fuse??.