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2009 Hyundai Genesis - Intermittent dead

At times when getting into the car there is no electric, the car is dead. Not even the door lights go on. Very sporadic. Wait 10 minutes and everything works, its like the outage never happened. Could happen once every other day or twice every week…you never know. Battery is new and been checked.

My guess without seeing the car and taking voltage measurements would be that the battery posts and cable terminals need to be cleaned.