even if you run a single black wire off the thermo you still will nee to split it to have a parallel circuit, or if one bulb dies the circuit is broken and eggs go cold?No it's right. I was getting it confused with the electronic thermostat's I wired. Although at the top connector of the thermo in this picture you could wire the two bulbs together and then run a single wire to the connection point, like it's shown with the red wire.
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