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Original post by: Joseph Hughes ,

Text:

The Magafe 2 connector will normally not have voltage output until it receives a signal from the computer to allow power through (the center pin communicates with the macbook for this reason). That is so it will not short out on other metallic items. It is normal to not have voltage until it is plugged in.

I have never tried a replacement magsafe cable from china, so good luck!

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