This last fall the driver would come in and say his emergency warning and buzzer would come on . Shut bus and restart and sometimes would fix it self . Then it got to the point it wouldn't go off . I found the solenoid was not getting power to turn on heaters and some accessories . So being school was almost out and no spares I bypassed the switch so the relay would stay on anytime the bus was on . Now I want to work on the switch . Does anybody have a wire diagram so I don't have to go and pull a working switch so I can see how it works .Also I am wondering if maybe the switch isn't strong enought to energize the relay ?