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New Charging Cable and a lower charge rate

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Tesla swapped out my charging cable as it was only charging the car to 60% I plugged in the new one today and the rate oif Charge seems extremely low.
Any ideas
 

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By "charging cable" I would assume you mean a UMC.
Assuming 50A outlet, it sounds like the 14-50 adapter at the end of the cable has the wrong resistor in it.
16A is what you'd get with a 5-20 adapter. You didn't make an adapter and plug a 5-20 into a 14-50 outlet did you?
If wall connector, check dip switches.
 
I would find another 14-50 outlet and see what it gives you. I was under the impression that the car has a way of testing the current load and will back off the power if it feels the circuit is over loaded. So it could be that logic in the car or the circuit.