Heater control lights stay on with lights off.

[rs74]

My 91 short bed z71 is having an issue draining the battery. The lights on the heater control stay on when the key is off. When the key is on they go off. Now when they are on the little arrow that light up as you move from cold to hot, about five of them are on across the board. They are not right next to each other either. I had been having problems when I went to turn it on. I would go to push a button on the control and it would shut down.

Should I look at replacing the control or something else. Also I should mention that someone has been under the dash and the wiring is a mess. Does anybody have a wiring diagram for the heater.

[rs74]

Anybody have any ideas?