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There are 2 sets of pins on the brake light switch, one connector for each set (2 connectors). One set is normally open (infinite resistance) the other is normally closed (0 resistance) when the brake pedal is not applied.
When the pedal is applied, the opposite is true, the normally open switch is now 0 resistance, the normally closed switch is now open circuit (infinite resistance).
If you want to remove the switch, it works kind of like left ahnd threads: clockwise to remove, counter-clockwise to install.
Gilly
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