OK, 12 volt DC, is low voltage and is not regulated like high voltage AC or DC. It is very possible that there is some "feed back" in the system somewhere. Now, the feed back may mean that there is a possible problem in the system elsewhere. Remember, the only thing in this World that is fact, is Death.
2004 Flair 33R, 336 watts solar, Dometic Sidewise frig. Pan hard bars, front and rear, CHF, Timbrens front and rear, Roadmaster reflex steering dampener. Doug Thorley Tri-y headers, small tune.