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Q: The car wont start it is completely dead

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Just had a new battery fitted, worked and started perfectly fine. Went to go and start it this morning and it's completely dead nothing switches on
My car has an automatic transmission.

This may be a bad ground connection. The fact that it was installed and worked correctly and then quit working suggests that you may have a bad wiring or ground connection. I would recommend having an expert from YourMechanic come to your location to diagnose your dead battery.

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