Q: what may cause the battery to go very low? on 2004 Chevrolet Venture

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I have replaced the alternator and battery once, about a year ago i hit a iron lid on the road and put a hole in the oil pan, then this problems atarted to happened. with that all the gauges on the panel started to go crazy....
(1) Answer
You may have a draw on the battery draining it when shut off. You may have a failing/failed alternator. Have checked at a qualified shop.