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Q: why dont battery keep a charge on 2006 Ford Freestyle

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battery checked ok charging system says ok but alternator reads doides pass but low reg,
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(1) Answer
Voltage regulator output should be above 14.0 Volts at 2,000 RPM engine speed. If it is not, this is your area of attention.

Since the voltage regulator is internal to the alternator, you are likely going to need to replace the alternator.
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