SOLVED: No power getting to the thermostat

You need a ground to get the 12v on a meter at the tstat, The two blues from the furnace are actually cut and joined at the tstat switch in a heat only. with an air conditioner it seems the wires all go to a relay up thee and back so it is red and white. Anyway, you can confirm the furnace works down at the furnace by jumpering the blues that would go to the tstat (but somehow get to the red and white on yours I think)

Too confusing, but here is a thread on that that might help including links to trouble shooting.

https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/30000743/srt/pa/pging/1/page/4.cfm