1990 126 Sedan dash light dimmer switch
 

The dimmer switch for the dash lights is not working. The lights do not go on when the headlights are on. If I turn the knob all the way to the left (clock-wise) the lights will then turn on but as soon as I release the knob they go out.
Is there a way to hot wire the switch so that the dash lights will be "full bright" when the headlights are turned on?
I think there are 3 pins on the PC board that the dimmer switch is attached to.
Thanks
Dan