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The normal swith for SPF's is a thermo switch located in the side tank of the radiator, driver's side. Two spades stick out of it, when hot the switch becomes continuitous. I believe (memory isn't getting any better) that it just completes the ground circuit for the fan relay trigger. So to turn the fan on with the radiator not hot, pull the wires off the thermo switch and connect them together, or you should be able to just connect (the correct) one to ground. You might be able to get a different temperatre rated thermoswitch too, but they are a pain to replace with an odd size and fiberglass in the way.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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