legacycentral bbs

Hey there. My car has just randomly started running really strange. Its an 92 rs and seems that somewhere a wire is earthing out. All the lights dim, the pwr steering goes on and off, the speedo flickers and heaps of stuff like this. The 'steering' and 'abs' lights flash on the dash also, but dnt think this is the prob, think that the short is causeing thim to flicker. Could be anything I know, but any suggestions?? The car has been converted from a auto to a manual if that narrows it down any.
Look forward to advice