I have 13.5v at idle which seems low, shouldn't it be 14.5v or around there? Also I parked it last night with the suspension up as high as it will go and come out this morning and it's dropped down. It started right up and once running for a little while it came back up to the highest level. Air bags, shocks, compressor etc are all brand new from the dealer.

 

13.8 - 14.4, with a meter of know accuracy, at idle, nothing else running (no AC, lights, wipers, etc.) As more things are switched on, volts may drop to 13.2