You might want to test your battery fluid levels... When they have been on 13.6VDC charge for long periods of time they may start out-gassing their fluids. Usually the battery is getting very warm before doing this. The gas is colorless, very poisonous, flammable and may have the odor of rotten eggs...
Just something else to check on for odor smell...
Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"