Furnace will pull lot of juice from house batteries, ergo gen did not have enough juice to crank without alt power from engine. You did not say if you were hooked to shore power or dry camping. I you do not have good insulation and dual pane windows, furnace runs longer and sucks batteries quickly.
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Logic will carry you from point A to point B. Imagination will carry you everywhere. "Albert Einstein". 2011 Georgetown 360, Bride of 45yrs, and 2014 Chev Equinox toad, what more could you ask for.
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