Stoplamps

When the brake pedal is depressed, the TCC/Stoplamp Switch contacts close to light the Stoplamps. The TCC/Stoplamp Switch has voltage available at all time from STOP Fuse 1 through the ORN (140) wire. When the brake pedal is depressed and the switch contacts close, this voltage is made available on the WHT (17) wire. The WHT (17) wire distributes the voltage to the four Stoplamp bulbs and to the Trailering Wiring Provision Connector C406, if provided. The WHT (17) wire also provides voltage to the Hazard Warning Switch and the Turn Signal Switch. This circuit is used for the Trailer Wiring Provision when single bulb turn/stoplamps are wired. The switch logic enables a single bulb on the DK GRN (19) or the YEL (18) wires to operate as a turn signal lamp even though the brake pedal is depressed.

Both the Left Taillamp and the Right Taillamp contain single stoplamp bulbs as well as single parking lamp bulbs. Both bulbs in the Left Taillamp are grounded by the BLK (150) wire to Ground G400. Both bulbs in the Right Taillamp are grounded by the BLK (250) wire to Ground G401. The Center High Mounted Stoplamp (CHMSL) has two Stoplamp bulbs. The CHMSL bulbs are grounded by the BLK (150) wire to Ground G400.