IF the car has been sitting for a week or so, the alternator will have to work hard for the first couple of minutes to bring up the battery.

IF the problem doesn't go away, have it checked.

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM