Brake light switch
In the diagram you can see stop lamp fuse and switch. The top wire is voltage to switch. The bottom wire is voltage from switch when switch is activated. You can use test lite to check for voltage. The brake switch should be activated by brake pedal arm. Voltage for lower stop lamps is wired through the multifunction switch. The high mount stop lamp isn't wired that way. Grounds are important also, ground wire is black in color.
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