2-Speed Cooling Fan Circuit only allows the fans to run when the engine is running (because it's powered by the fuel pump relay), but gives the driver control (OFF) for water crossings or (ON) in case the temperature switches fail.
In this configuration, if the HI relay contacts fail, the fan will still run at a lower speed. This circuit is NOT suited to a 2-speed motor because both HI & LO are powered.
For a single-speed system: delete the hi relay, 210 switch, & resistor. For a single-fan system: derate the main 40A fuse to 20A.
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For carb, splice the 3A fuse into any RUN circuit, like the ignition module or voltage regulator.
See also:
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https://www.fleet.ford.com/truckbbas/non-html/1997/c37_39_p.pdfThis diagram was created from this set of symbols using MSPaint:
