If you can see the schematic, it will show the color of the wire to the gas valve. I use a test light that can pierce the insulation and then just start the furnace. As for the igniter, if you hear it clicking it’s probably working.
Another possibility is the burner is covered with a mud dawber nest.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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