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Q: Why did red light come on saying stop engine battery, alternator on 2008 Mercedes-Benz SL550

Red light diplaying battery and note saying stop engine. What does this mean
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It's the aux battery... It probably needs a charge, driving the car for a bit and then maybe restarting should ale care of it...

Either the car was parked for a while and the batter just needed a light charge to get going or you probably need to get it checked out by a Benz repair specialist...

For me driving it around for about 15 min and the. Restarting helped out just fine...
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