Alternator or Battery?
When I drive the car during the day I have no problems with power loss or any messages in the Idrive. When I drive at night, the interior lights flicker, the dynamic drive malfunction message comes up, the cigarette lighter does not work, the heated seats and steering wheel turn off and the idol is erratic. Also, when I am on the highway, you notice a sputter in the accelleration.
She's a 2005 with 116,500 miles. The battery is 2 1/2 years old. I am almost positive it is the original alternator.
Any ideas what this might be? If alternator, how much should I expect to pay at an Indy shop?
Thanks for the help