Jumper red and yellow together did not cause the fan to come on. I know the thermostats are good because I hear them clicking when set to cool.
Decided to look at 12V fuses. One labeled 'Appliances' (15 A). Checked it and it was blown. I replaced the fuse and all is well now.
Thanks for the tip on isolating the thermostat - that caused me to check the 12V angle.
Both thermostats now digital with a very narrow temperature swing.
Marshall
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