Hopefully this is nothing, but I want to make sure that it isn't telling me something is going out. It is colder then whatever up here in Minnesota this week and I noticed something about my voltage guage. Normally it rides right about in the middle of the scale, but recently is moves up to about half way through the upper half. It's not at the upper limit or outside of the normal range, just different then I am used to. Has anyone experienced this type of change or is it just because it's about -20......