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engine cooling fan switch
#1

I've been tinkering on the SVO off and on for the past 6 months, after leaving it sit torn apart for almost 10 years.  I did get it fired up, just to check things out, after installing a MicroSquirt and harness.  I'm looking over the cooling system at this point and have a couple of questions about the radiator cooling fan.  I recall replacing the fan controller under the driver's side dash several years ago.  I have a yellow wire with red stripe in the engine bay with an eyelet connector on it.  It comes out of the factory chassis harness, just in front of the master cylinder.  When I touch this wire to the battery ground, the fan comes on.  I think this means everything is working as expected.  I did change the intake from inline to square and I seem to have lost the fan switch.  If that wire goes to the fan switch, I assume it will be similar to the coolant temp sensor with just a single post and it goes in the lower intake on the back side of the center bump out (the wire does reach that location).  Is this correct?  When I checked a few websites online, the switch shows as a 2 wire requiring a plug, so it seems strange given everything I thought I knew.
Early 85 SVO
Keedysville, MD
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#2

Fan switch is a single wire like the temp gauge. It should be in the lower intake near the coolant hose fitting also in the lower intake.

With that said, your Microsquirt can control the fan if you wire and configure it to do so (assuming you aren't using all of your outputs for other things) and it doesn't use the single wire sender to do so (it uses the 2 wire coolant temp sensor that the ECU uses for engine temp).
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#3

Thanks Stinger, after multiple searches online and not being able to find the correct switch I started researching that option.  I think I'll use ALED (pin 16) for fan control and WLED (pin 17) for boost control.
Early 85 SVO
Keedysville, MD
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