I washed my car last night while at work (but before my shift, of course) and decided to spray off the engine to get some of the dust off. After washing the car I parked it in the shop while it dried off to prevent dust from collecting on it (I washed it with demineralized water hence the need to only let it air dry). When my shift was almost over I pulled my car out to let it warm up when I noticed that the DIC was showing "Service Charging System". I simply thought that I got a little bit of water in the alternator and it will just evaporate as the car warms up. No dice, on my way home I reset the DIC only to have the message eventually come back in... Not a big deal... UNTIL, about 20 miles into my commute my radar detector starting flashing "Hi VOLTS" and my lights and everything else turned off and back on. The volt meter in the instrument cluster was reading 18v... not good. I was a good 10 miles from home so I figure I should pull over and cycle the motor to see if it would clear. This did not work and I ended up driving the next 10 miles home with the alternator putting out 18v. I have two questions here; 1) Has anyone had this happen to them and what was the cause? 2) Can driving 10 miles with 18v hurt anything? The second question is important because the nearest dealer is 15 miles away. Thanks in advance for any help! And just for reference, I have a 2007 C6 Z51 MN6 built in late Sept. with 1900 miles on the ODO.