Turn signals turn on hazard lights?

[elcidd]

Ok, just bought this truck and the hazard light switch is gone from the side of the column. When I turn the either the right or left turn signal on, both flashers come on like when the hazards are on. In the front only, the rear turn signals work ok. Oh yeah, both turn signal indicators on the dash flash like when the hazards are on. Any clues where to start looking?