Forgot to mention that when I unplugged from SP it dropped to 12.3v which I know is wrong. I bought the MH up to my shop and plugged it in there. It went to 13.5 and stayed there overnight. I unplugged SP and this time the overhead lights didn't blink, it dropped to 12.6v and stayed there for a couple of hours (fridge is running) before going to 12.5. Checked power at the camper shed, it looks good (125v) and only drops 2 volts under load. Will put the MH back in Camper shed and see what happens.
Retired USAF E8 (Vietnam Vet) & Retired VA & Retired!