It means it is charging.
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If it's yellow, then the wii remote is done charging. But if you put the wii remote on the charger and it immediately turns yellow even though your remote has no batteries, then your charger has problems/it's broken.
If you mean the green power light, perhaps the yellow/red standby light blew out? If you're referring to the blue light in the disc tray, you can turn this off and on in your Wii settings. >Wii Settings >second page> WiiConnect24 >Slot Illumination Bright, Dim or Off
The yellow light is the WiFi signal, the orange is the console Charging and the blue/red light is how much battery is being used
While using the Trainer's Eyes feature within the PokeNav, the light at the left will blink blue if there is someone in the area who is available to re-battle.
What do you mean by Jacket? If it is a case you could rinse it with water and fry it VERY VERY VERY goof so no water gets to the wii remote.