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My Tahoe is starting really slow but its a brand new battery just purchased yesterday and auto zone tested alternator and battery and they said it is good. What could the reason be?

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An alternator really needs a load test to be sure--it could be drainin batt if diode is bad----batt should always read 12.6volts. Other drains like wiring or lights may be causin too. Titen the terminals at battery posts again-mite be loose-its a common issue--i

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