Circuit Operation - Instrument Panel Dimming

With the Headlamp and Panel Dimmer Switch in PARK or HEAD, voltage is supplied to the Instrument Panel Dimmer Switch. This voltage goes through the ILLUM Fuse 14 to the illumination lamps. All of the lamps are permanently grounded, so they light. The intensity of the illumination lamps is controllable via the Headlamp and Panel Dimmer Switch. The rheostat in the Headlamp and Panel Dimmer Switch varies voltage to the lamps, which in turn, also varies lamp intensity.