I may need to replace the furnace; I really don't know why because it's 'only' 21 years old. Anyway, it's always worked fine but on this trip, it only lights when electricity is available. Unplugged...
Thanks; appreciate the replies. Again, I have new batteries, installed last month. I can watch hours of TV, lights, etc; and I have a digital volt meter, constantly visible. Available DC power is not an issue. I'll check the wiring and contacts. When the furnace is off, or when it's lit, I'm not sure how to check voltage. To my understanding, dc is only present to 'shoot' the spark. Can/ will someone elaborate?