Twilight Sentinel

HEADLIGHTS

Voltage is applied to the Headlight Switch at all times. The Headlight Switch includes a self-resetting circuit breaker which opens if the headlight circuit draws too much current. When the Headlight Switch is in "HEAD," the Headlight Dimmer Switch directs current to either the LO Beams or the HI Beams. When the Headlight Dimmer Switch is in "HI," current also flows to the HI Beam Indicator.

TWILIGHT SENTINEL

The Twilight Sentinel System automatically turns the interior and exterior driving lights on and off according to light conditions. The system also keeps the lights on for a selected amount of time after the driver has parked and left the vehicle. The system can be turned off to give the driver manual control over the lights.
The Twilight Sentinel will send a lights "ON" signal to the Audio Alarm Module only if the Headlight Switch is in the "PARK" or "HEAD" position.
Voltage is applied at all times through Fusible Link C to the Headlight Switch terminal "C" and from the Headlight Switch terminal "B" to the Twilight Sentinel Module connector C2 terminal "D".
When the Ignition Switch is in "RUN," voltage from Fuse 17 is applied to connector C1 terminal "E" of the Twilight Sentinel Module. Ground is supplied from G200 through the Twilight Sentinel Switch.
As the intensity of light reaching the Photocell Light Sensor decreases, the resistance of the Photocell Light Sensor increases. When the Twilight Sentinel Module senses a high resistance in the Photocell Light Sensor, the Twilight Sentinel Module energizes the Internal Head Relay. Battery voltage is applied through the closed contacts of the Head Relay to CKT 10. With the Headlight Dimmer Switch in "LO," the LO Beam Headlights are "ON." With the Headlight Dimmer Switch in "HI," the HI Beam Headlights and Indicator are "ON." The Twilight Sentinel Module also energizes the Internal Park Relay, which applies battery voltage to CKT 9 and turns "ON" the Tail, Front Side Marker and Opera Lamps.
As the intensity of light reaching the Photocell Light Sensor increases, the resistance of the Photocell Light Sensor decreases. When the Twilight Sentinel Module senses a low resistance in the Photocell Light Sensor, the Twilight Sentinel Module de-energizes the Internal Head Relay which turns the Headlights "OFF," and also de-energizes the Internal Park Relay which turns the Tail, Front Side Marker and Opera Lamps "OFF."
If the Ignition Switch is moved to "OFF," the Twilight Sentinel Module loses ignition voltage through Fuse 17, and will cause a delay of five (5) seconds to three (3) minutes and then turn the lights off. This delay is set by changing the resistance of a delay rheostat in the Twilight Sentinel Switch.
When the Twilight Sentinel Switch is turned to "OFF," the path to ground at connector C1 terminal "A" at the Twilight Sentinel Module is opened. The system is turned off and the Headlamps will operate only by moving the Headlight Switch to the "PARK" or "HEAD" position.
The Twilight Sentinel Module does not react instantly to photocell signals. Turn-on or turn-off is delayed about 30 seconds. This avoids needless operation for short periods of time.