98 silverado turn on left or right turn signal and the emergency flashers come on. with turn signal in off I turn on the headlights and the emergency flashers come on. also the dash lights flash with the emergency flashers
have you replaced any light bulbs recently? you may have put in a wrong type of bulb. Some of the turn signal bulbs are dual element. turn signal and parking lights. If you short the two systems together then when you turn either the parking lights or the turn signal that is shorted then you bridge both systems together and they all turn on at once.