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The most common causes of this problem are either a bad dimmer switch or loose connection. Testing with a 12 VDC test light is the best way to try and track this down. You should be able to get some wiring diagrams from Tiffin. I am adding a link to their site for you. Once you have those, please get back to me if you need some additional input from me here as all follow ups are included in our fee and fully expected. http://tiffinmotorhomes.com/contact
You might want to pick up a good 12 VDC test light as well. Very handy and easier to use on this sort of diagnosis. A "test ground" is helpful as well. Just a length of wire with an alligator clip on each end. Lots to learn about RVing and all the little preventative maintenance things you need to do each year. Don't neglect the LP pressure at the tank regulator and the batteries and cables. Many LP and electrical issues can be tracked down to those items. I will offer you my own phone chat option here which is less money and more versatile than the one the site offers. Totally optional! Thanks for giving us a "shout" here at Just Answer!
I will be around all day. I am in Northern California and we got 18" of snow a few nights ago and I live off grid and am snowed in for a bit!
Yep! The only power I have is what I make myself. Can be a challenge for sure!
Know all about that.......one reason we bought this place a few years ago.