Tail Lamp: Description and Operation

Voltage is applied at all times from I/P Fuse #31 to the Headlamp Switch and, if equipped, to the Automatic Headlamp Control or Daytime Running Lamp (DRL) Module from CKT 240. With the Headlamp Switch in "PARK" or "HEAD" or with low light conditions, if equipped with Twilight Sentinel, voltage is applied to CKT 9. Current flows through CKT 9, to I/P Fuse Block, which feeds all Park, Marker, Tail and License Lamps turning them "ON." The only lamps that see a current from CKT 308 and do not turn "ON," are the turn filaments in the Park/Turn Lamps. They do not activate because the voltage drop across the Front Side Marker Lamps is much higher than that across the Turn Lamp Filaments.