2000 Dodge Durango has no headlights

Just purchased a 2000 Durango. Was told the
heater core was just replaced. The headlights and
fog lights don’t work. I have replaced the headlight
switch, the multifunctional switch, and the
headlight bulbs. Power is going to the headlight
switch. It does some weird things. If I turn my turn
signal on it work, but when I turn my headlight
switch on the blinkers stop working. Also, when I
turn my headlight switch on, the hazard lights
show up on the dash and stay solid. Hazards don’t
actually come on, just shows they are on, but
again, it’s solid and not flashing on the dash. Any
ideas on what it could be or what I should try
next?