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hello, how long has it sat when the battery was low? just overnight? do you own a voltmeter?
thanks, ***** ***** I could have you do your own simple testing, My thought? am rather confident on this? you have a failing battery and not and alternator, When an alternator begins to fail? it stops charging the battery so,, you would experience a low battery each and everytime you shut car off. alternators rarely charge one second then not the next , they generally just stop charging and each time you shutoff? it will need a jump as well as things would slow down while driving like blower, headlights, wipers and the computer would begin setting codes related to low volts, I think why the code for regualtor is the alternator is trying to charge a bad battery and strains to do so and set that code. I could be wrong but , by description , symptoms and so on? you have a battery going bad, They can act like this at different temps and so on, alternators generally just stop charging and you would have starting problems everytime you drive, I am near 99% its time for a battery
I really feel this is all it is,
Please remember to leave feedback etc for my service I provided and thanks, ***** ***** you have any followups