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    LML Questions about new 2012 Duramax pickup

    Just took delivery of our new 2012 2500HD Duramax/Allison w/towing package this week. It's our first diesel truck and I have a few questions. 1) This pickup came with two 125 Amp alternators. Why ? Redundancy or specific need ? It's a $270 option. 2) I noticed there is no redline or yellow...