Interior Backlighting

The interior lamps dimming group consists of the following lamps:
- HVAC control head assembly
- Radio
- The Instrument Panel Cluster (IPC)
- The ashtray lamp
- The Power Take Off (PTO) switch
- The Door and window switches

When the headlight switch is turned to the PARK or HEAD position, all incandescent back lighting turn on at the dimming level indicated by the IP dimmer switch. When the IP dimmer switch is moved from MIN to MAX, all incandescent back lighting will respond from minimum intensity to maximum brightness in response to the IP dimmer switch.

The instrument panel dimming system operates to provide a variable level of illumination at the speedometer and control switches. By adjusting the position of the dimmer control on the IP cluster, a variable voltage is supplied to the system lamps and components. The instrument panel lamp dimmer switch consists of an internal potentiometer which varies the voltage to the lamps depending on the position of the dimmer wheel. The intensity of the lamps vary according to the position of the IP dimmer switch.