Tesla won't charge from home 240v


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Old 02-28-21, 01:39 PM
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Tesla won't charge from home 240v

I have a 3-prong 240v outlet in my garage (despite having been labeled as 220 by as previous owner). I have tested both hots against the neutral and gotten 121v off each. Testing hot to hot gives a little over 240, like 247, which may be due to my inexpensive voltmeter.

My friend came over with his Tesla and a 6-20 plug adapter. The Tesla began charging, then stopped. We could not get it to finish charging. The 20 amp breaker did not trip.

Any ideas on how to troubleshoot?



 
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Old 02-28-21, 08:49 PM
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Did you check and see if you still had 240v at the receptacle ?
 
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Old 03-01-21, 09:25 AM
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Yes, 240v is there as originally mentioned.

We also tried a 120v adapter in a 120v socket. It also failed. We now suspect the Tesla Mobile Connector is defective and my friend will try to replace it under warranty. He had never used it anywhere but my house.
 
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Old 03-01-21, 09:34 AM
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That would be a wise assumption.


 
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Old 03-24-21, 03:56 AM
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Originally Posted by RocketJSquirrel
I have tested both hots against the neutral and gotten 121v off each.
Double check the wiring for that outlet to determine whether it is a neutral or ground. IIRC, a 6-20 is supposed to have a ground, NOT a neutral. It's a common mistake when wiring those outlets.

Check if the Tesla is in some sort of safe mode and some sort of "do not charge" code has to be cleared. A large metal car charging at 240v without an actual ground in a potentially wet area (outdoors or garage) would be a great way to electrocute somebody, so there's probably a safe mode when "no ground detected"
 
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Old 03-24-21, 09:14 AM
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Yes, Hal_S, I was mistaken when I wrote "neutral". It is actually a ground, verified by removing the face plate and observing the bare wire connected to that terminal.
 
 

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