Pololu - Mini Slide Switch: 3-Pin, SPDT, 0.3A (3-Pack)
Amazon.com: 2 Pin and 3 Pin Way Car Waterproof Electrical Connector HID Plug Auto Electrical Wire Connectors 1.5mm Series Terminal and Rubber Seal with Wire AWG Marine, 10 Pack : Automotive
2-Pin to 3-Pin Fan Adapter Cable - Style D CB-YA-D2P