Chosen Solution
I plug the nunchuck while playing New Super Mario Bros Wii and it says “This extension controller is not supported.Please remove the extension controller”.In other game like Punch-Out,it doesn’t even detect the nunchuck.I disasembled the nunchuck and the nunchuck output and the cables were look fine.
Tear it down and use a multimeter to test the output: http://kylepowers.info/nunchuk-disassemb…
I saw that the link post above was not working anymore so I do a video on how you can test the wire connection and solve the issue. If you are lucky, you won’t even need a multimeter to do this repair. https://youtu.be/k9sDR7wS3rg
I have the same problem and was glad I found this link, but sadly its not active anymore
