i have an automatic g35 coupe 2007 that dies on me randomly. i checked the battery and that's fine same thing with the alternator. definitely electrical tho. when it dies i can start it up again a couple min later without a jump start. there was one time i locked my car and when i opened the door coming back the high beams started flashing on and off as if the alarm was set off there was no beeping from the alarm the power was completely gone my lights inside wouldn't turn on or anything alike. if anyone has a solution or suggestion on what it could be please comment it would be very helpful.

 

Did you take the battery and the alternator out of the car to get bench tested ? If not I would do that..

my g35 was dying too, autozone checked with the mobile device and it said the alternator was bad. So I took it out and had orielys bench test it out of the car, and it passed two times. So I put it back in and had the battery tested separately and it turns out the battery was bad. It was putting out enough voltage and fully charging, but one of the cells in it went bad and it would die under load. Hopefully it ends up being something dumb and easy for you and not a bigger issue

 

Does it usually happen during rainy weather?