1994 Buick PA Headlight staying on

You might have already answered this a million times over but I would like to know what causes them to stay on? They will not go off when cars is off. Also the air compressor comes on while the car is off as well.
I also have unplugged the headlight switch and the twilight sensor thing and they still stay on.

The front air compressor comes on when the car is off as well.

Any Ideas?

Thanks in advance

You might have already answered this a million times over but I would like to know what causes them to stay on? They will not go off when cars is off. Also the air compressor comes on while the car is off as well.
I also have unplugged the headlight switch and the twilight sensor thing and they still stay on.

The front air compressor comes on when the car is off as well.

Any Ideas?

Thanks in advance

You could check the wiring at each lamp to make sure there isn't a ground or open on any of it. Otherwise possibly the Twilight sentinel relay may be suspect.