1996 Ford Taurus fan blowing on high

Ford Taurus

Fan blowing on high

I drove my car to work and everything ran fine. I shut it off at work. Then after work restarted the car. It started right up and is running fine but the speedometer, blinkers, brake lights, heater/ AC ect are not working. The heater fan in the car is blowing on high even though it is “off” and the tachometer and fuel gauge is working. Ive never seen this before. Where should I start?

The blower working without being turned on is most commonly a sticking relay. However with all the other issue going on it might be more than that. I would start by checking the connections at the battery. Then isolate each circuit and check the connections and wiring harness. When wires cross or become brittle it can do some weird things.