might be old wiring...I have a similar problem. even with driving the car every day. Certain times I turn on the car I get low voltage...if I rev the car past 3K rpms the volts shoot up to normal. I especially notice it at night. When I do it the dash gets brighter and all is cool. I am not sure what it is either but the only thing I can think of right now is old wiring. I mean my car is 12 years old...not sure what year 7G you have but its anywhere from 10-14 years old
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