Chart No. 6-1, Stop Light Switch Wiring Circuit

When the brake pedal is depressed during constant speed travel, the stop light switch contacts for the cruise control system open, creating an interruption in the signal to the actuator electromagnetic clutch, cancelling the constant speed travel.
The flow of current is from the battery to fuse No. 17 of the junction block, stop light switch, to the control unit.
Test terminal No. 15, release valve open/close, when the brake pedal is depressed. Voltage should measure 12 volts.
Test stop light switch (load side) input, terminal No. 15, when the brake pedal is not depressed. Voltage should measure 0 volts.