Problem developed while driving at night. High beams on, put on left turn signal and all the headlights, turn signal lights, driving lights, marker lights up front went out. Also a puff of smoke in the multi function switch. Checked fuses all good. Replaced multi function switch. Turned on left and right turn signal and they worked. Turned on headlights, they worked. Turned on turn signals with headlights on and everything went out again. Same wire terminal in new multi function switch shorted out. Obviously a short somewhere but can't figure out where. Have chased as many wires as I could fine but can't find anything suspicious.