A couple days ago when I was driving to work I heard my dash go off and saw the check gauges and looked at everything. My voltage meter was sitting at around 12 when its normally around 16. I was wondering what I might look at first or any ideas what it might be. 2006 3500 167k on it. Stock with Edge hooked up but on stock. Also noticed that when i was letting her warm up after 5 minutes or so she would kick up idle to around 1k and i would go out and tap the pedal and it would drop back down.

 

CLEAN ALL YOUR BATTERY CONNECTIONS! TEST YOUR ALT! IDLE UP IS AUTOMATIC WHEN YOUR GRID HEATER COMES ON