2-Speed Cooling Fan Motor Circuit only allows the fan 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, speed is always determined by the hi-temp switch & speed relay.
For other configurations, see:
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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:
![fancircuitb.jpg 2-Speed Cooling Fan Motor Circuit only allows the fan 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, speed is always determined by the hi-temp switch & speed relay.
For other configurations, see:
[url=http://www.supermotors.net/registry/media/575615][img]http://www.supermotors.net/getfile/575615/thumbnail/fancircuit.jpg[/img][/url] . [url=http://www.supermotors.net/vehicles/registry/media/642421][img]http://www.supermotors.net/getfile/642421/thumbnail/fancircuita.jpg[/img][/url] . [url=http://www.supermotors.net/registry/media/978809][img]http://www.supermotors.net/getfile/978809/thumbnail/fancircuitc.jpg[/img][/url]
For carb, splice the 3A fuse into any RUN circuit, like the ignition module or voltage regulator.
See also:
[url=http://www.supermotors.net/registry/media/849725][img]http://www.supermotors.net/getfile/849725/thumbnail/fusesblades.jpg[/img][/url] . [url=http://www.supermotors.net/registry/media/624973][img]http://www.supermotors.net/getfile/624973/thumbnail/heaterpipesensor.jpg[/img][/url] . [url=http://www.supermotors.net/registry/media/830776][img]http://www.supermotors.net/getfile/830776/thumbnail/fusiblelinkrepair.jpg[/img][/url] . [url=http://www.supermotors.net/registry/media/832986][img]http://www.supermotors.net/getfile/832986/thumbnail/bulbsfuseswire.jpg[/img][/url]
https://www.fleet.ford.com/truckbbas/non-html/1997/c37_39_p.pdf
This diagram was created from this set of symbols using MSPaint:
[url=http://www.supermotors.net/registry/media/858661][img]http://www.supermotors.net/getfile/858661/thumbnail/wiringsymbols.gif[/img][/url]](https://www.supermotors.net/getfile/894038/fullsize/fancircuitb.jpg)