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The two blue wires are for the thermostat leads. One is red and one is white and they are usually bell wire. The positive lead coming in is red (usually) and the ground lead is yellow or white. See the wiring diagrams in the Atwood Service Manual I have attached for you. Print it out as there is a lot of great information in there. Please get back to me if you need more on this as all follow ups are included and fully expected. http://bryantrv.com/docs2/docs/hflamefurn04.pdf
Just checking back in to see if you were able to resolve this or do you still need some additional input from me?