Thanks for the Post, I am trying to get the screw for the ground wire loosened, Kind of Tight, Your suggestion sounds very logical,
Some of the other things I seen happening besides my 12 volt lights fluctuating, is the furnace fan blower motor also slows down and the Carbon Monoxide detector light that normally flashed GREEN, will flash YELLOW, then return to Green when the voltage goes back up.
Plugged into shore power 110v? Running on batteries i get weird flickers. Could be a loose wire in the panel or a converter issue. If your on shore power , It sounds like the converter can not handle the surge from the fan motor and dips low in voltage causing a restart in the carbon detector. Any other thing cause a flicker except the fan motor? Have you tried the water pump?