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Old 03-20-2011, 10:16 AM   #1
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Default Manual Rad. Fan Switch wiring diagram

I'm looking to wire a manual switch for my fan, and came across a lot of threads asking for a diagram on how to do this. Here is a pretty straightforward set of instructions and a diagram.


It is the diagram from SPAL Fans for wiring a single fan. It looks like SPAL provides a new relay, so people looking to do this will have to find out what color their OEM relay wires are and make corrections accordingly.

Just putting it out there.

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Old 03-20-2011, 11:46 AM   #2
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Default Re: Manual Rad. Fan Switch wiring diagram

It would be ideal to wire a switch in such a way that the fan can be turned on by you, but still be wired to a temperature switch so it will turn on automatically. Most radiator fan temperature switches ground when the rated temperature is reached. This completes the signal circuit of a relay, which then handles the heavier current needed by the fan. This sounds like the gray wire for the spal fan. The safest way to wire this is to have the gray wire "y", one branch of the y goes to the temp sensor, and the other branch goes to a toggle switch that is wired to ground. When the toggle closes it provides ground and will signal the relay to turn the fan on. However, this also leaves the temperature switch capable of turning the fan on if the toggle is left open - the temp switch now provides the ground. This is safest because even if you leave the switch "on", it will not harm the temp switch -you just have two sources of ground hooked to the relay's signal circuit. In this way, you can have the manual switch as an override but retain the automatic function of the fan switch.
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Old 03-21-2011, 10:43 AM   #3
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Default Re: Manual Rad. Fan Switch wiring diagram

Yeah, having the fan remain hooked up to the thermostat switch is still a good idea. Especially in case you forget to turn the fan on.

But having the fan run constantly with an inline fuse shouldn't hurt anything...
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Old 03-21-2011, 11:17 AM   #4
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Default Re: Manual Rad. Fan Switch wiring diagram

Just wire a switch that opens the coolant temp switch on the radiator. When the circuit is open, the fan comes on; when its closed everything works normal. All the coolant switch does is open when the temp gets hot enough.
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