Do you have a 24 volt chassis system? If so, I occasionally have the indication as well, and it goes out after a few seconds. Others will weigh in on this, but in my view at this point, I think what happens is the 12 volt equipment, including clocks and miscellaneous other 12 volt equipment that runs when the coach is shut down tends to unbalance the 2 banks (of 2) chassis batteries by pulling down the side those 12 volt loads are connected to.