It sounds like a wiring problem for sure. I'm not really sure about the wring of these cars just yet, not had to look into that area

Take the bulb/socket out and see if any of the wires look burnt or if the inside of the socket where the bulb sits in looks burnt. My old dodge had this same problem, the bulb sockets were burnt up some how :/ So start with that and if all looks fine, then it might just be a wiring problem.