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If the switch was good, then more than likely the headlight relay is bad or there is a loose connection somewhere. I have no knowledge about where the headlight relay is on this and you may have to contact Tiffin Customer Service for that info. I am attaching a link to that site for you. http://www.tiffinmotorhomes.com/contact
Didn't want you to just sit there and wonder why nobody was responded. And you never have to pay for what you aren't satisfied with. I wil opt out of this and allow another tech to offer something if they can.