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Charger Serial Number

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I believe there is a sticker on the wall connector (not sure if it is on the side or inside the glass cover. The serial number is labelled TSNxxxxxx.

I also believe it is on the quick start guide (that has the QR code).

It this doesn't help, you could call tesla: for owner support and issue troubleshooting: (888) 765-2489 (this is from the wall connector installation instructions)