A set of pictures showing how I extended the wire for the "sensor bar" on a Nintendo Wii game console, and also made it possible to connect the sensor bar to an external power supply.

(It turns out that the "sensor bar" is actually just two groups of IR LEDs, wired to use a 12 volt power supply. If you splice plugs into the wire, you can use an extension cable, or an external REGULATED 12 volt power supply.)