Which lights? All the interior lights on the Axis are 12V--they won't shut off with the genny.
What model year? Is the genny used much? (See another thread on here with similar problems that running a tank of Seafoam through cleaned it up--
http://www.thorforums.com/forums/f8/...lems-9183.html)
It is unlikely that the genny is overheating as that isn't a common problem with 24.1 genny's.