hi i have a 2007 mdx last week the check charging system came on and the sh awd turned off.last two days -35 it starts up no problem the jeep runs like new.Today the check charging system warning turns back on and the sh awd turns off. Im thinking the alternator is about to go and im guessing the awd system turns off to save energy since it only comes on once the check charging system lights turn on.Can anyone help