Hey, this sounds like a design flaw, I have given up trying to find electrical leakage when shutdown of all machine for the past 5 years in my 860!!!. Have been just disconnecting at end of day, probably safer anyway if you developed a short overnight somewhere in system. I think the short is somewhere in combine monitor_warning systemIJIJ The BEST solution is to buy a "Kill Switch" from Caterpillar dealer and install. These are standard issue on most newer Cat implements.