Plug in the power supply to the outlet. Then plug the Magsafe to the Macbook. The order here may be important.

As usual, the light is green and then turns to orange if charging is required. If not it remains green.

You can observe some colour changes in the light when charging. Every time you will plug in the Magsafe this can happen 2-5 times and last from 2-3 seconds. I have observed that if you let it be, the orange light will remain after a few flickers.

I have also noticed that sometimes the charging light will only stay on for a few seconds until it turns off. I still have not discovered why sometimes it works and other times it does not.