Thanks for the idea. Each time at 15F and 25F days, the first start was identical. All three cylinders died together just like stopping the fuel supply. The third day at 25F, the start was normal. The tractor was run for an hour each of the first two days. Maybe the water, if any, worked it's way through. I'm going to do some more testing/checking/starting before I install the new switch and I will disassemble the old one to see if the contacts are really corroded. I want to be sure of what caused the problem.
Vic
Vic