Darl....the following is a direct quote from post #34....

"Here is the procedure I would use to check this, and why.....

I assume your batteries are up to their desired voltage and are connected according to the Prevost diagram. Obviously this is essential to insure you get the right voltages to the 12V and 24V circuits....."

Perhaps rule number one should be to never leave anyone without Prevost specific experience and knowledge alone with your coach, and after anyone touches your coach verify what they did and if it was right.