What can cause delayed alternator charging? on 2006 BMW X5

Alternator does not charge for 5 to 15 minutes after the first engine start of the day. After this delay I feel the engine surge with the alternator load coming on line and the alternator will charge 13.9-14v all day/night. No problems with subsequent starts. Next morning, same scenario. No alternator charge for 5-15 minutes , then it kicks in by itself. No fault codes from my OBDII scanner. Belt is not slipping and tensioner is tight. No unusual noise from the alternator. Alternator works just fine all day after the first 15 mminutes.

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1 answer
could be bad regulator or other issues,seek diag as not to waste money