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2010 Express Duramax Ambulance dual alternator dianosis

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He all ,

         I have a 2010 Duramax Ambulance that has the charge light on. I normally wouldn't ask cause it would be pretty easy to figure out but this thing has 2 alternators. It is throwing charge and runs up around 14volt on the gauge, but I have the charge light on and that is throwing a code that flashes on the message center thing. The ambulance was tipped over on and landed on its side and could've messed something up in the wiring, then again it could just have a bad alternator. How could I check the circut hat turns the charge light on to see if thats the culprit 1st?  I've got a fan speed code I need to dig into also I believe is for the cooling fan which could be wiring related. The main trouble is the charging for now. 

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