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REAR TURN, STOP, ANDHAZARD SYSTEMSThese three systems use the same bulb in the rearlamps. When the rear turn system is turned on, athermal oscillator is turned on, which causes thesystem to flash. The front park lamps are also a part ofthe turn system.The stop lamp system is turned on by a brake switchclosing. The two rear bright lamps are then turned on.The hazard system is turned on by the hazardswitch. The hazard system thermal oscillator is thenturned on which causes the front park lamps and therear bright lamps to flash.
If your answer is "Yes" then the brake circuit can be separated out from the turn signal switch to power the brake lamps independently of turn and hazard functions.
Disconnect the white wire from the brake light switch and tape up the bare end. Connect a new red wire to the brake switch and run it to the rear of the truck, connecting it as described by JohnnyPopper.
Is your avatar the truck you're working on? If yes, do you have replacement tail light assemblies that contain a third bulb? Any info on this question?