VW Brake Light Switch, 3 Prong, Beetle/Ghia/Type 3/Bus/Thing 1968-79, Vanagon
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Helpful HintsThe brake light switch is a simple open/close circuit. It does not matter which terminal is powered (input) and which terminal is output. The wire from the fuse box to the switch and the wire to the brake light bulb is black with a red stripe from the factory. Later models might have black input wire. On three terminal switches the input and output terminals are the two parallel terminals.
The 3 terminal switches have an output signal which is wired to the brake light warning switch light on the dash. It is a red wire.