Thanks Strife. After I posted this question I looked at some rather old stuff and a guest had said the same thing and he had numbers of two negative thermistors that would would work. He also suggested temporarily replacing the thermistor with a 3000 ohm resistor. That would check the circuit and he thought the thermistor would cost about $5.00 at an electronics store. If the rain from Ivan goes away I may try it and will let all know from this post.