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How did you wire your manual fan switch?

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Old 06-30-2007, 12:49 PM
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How did you wire your manual fan switch?
Well, how did you wire up your manual fan switch? I was thinking about just running +12V to the fan, and putting my switch in between the ground. Any suggestions?
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Old 06-30-2007, 01:20 PM
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Bad idea, IMHO. Easier, better to use the relays that are already in the fan circuit.

http://shbox.com/1/fan_sw_diagram1.jpg
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Old 06-30-2007, 01:29 PM
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Originally Posted by shoebox
Bad idea, IMHO. Easier, better to use the relays that are already in the fan circuit.

http://shbox.com/1/fan_sw_diagram1.jpg
Those are the instructions I used to wire my 94, seemed to work fine. I just had the low speed over ride for when it was sitting at the track or something, course they're quiet enough at that speed that you might leave them on all night. Not that I know of anyone that might have done that.
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Old 06-30-2007, 02:47 PM
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so basically I am just grounding the green and blue wires, correct?
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Old 06-30-2007, 02:52 PM
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That is right. You are simulating what the computer does to turn on the fans.
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Old 06-30-2007, 03:07 PM
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just running the 2 wires to either side of a switch? thats it?


those wires go to a rela correct? so there is no need to add a 12v or ground?
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Old 06-30-2007, 03:17 PM
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Originally Posted by mdacton
just running the 2 wires to either side of a switch? thats it?


those wires go to a rela correct? so there is no need to add a 12v or ground?
No, you splice in to those wires, and ground them. This energizes the relay, which turns on the fans. At least thats how I have come to understand it.
Last edited by The Captain; 07-02-2007 at 11:22 AM.
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Old 07-02-2007, 11:22 AM
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Originally Posted by The Captain
No, you splice in to those wires, and ground them. This energizes the relay, which turns on the fans. At least thats how I have come to understand it.

Anyone care to elaborate on this?
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Old 07-02-2007, 01:27 PM
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Originally Posted by The Captain
Anyone care to elaborate on this?
That's what the schematic shows.
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Old 07-03-2007, 01:31 AM
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So this way You can manually turn them on, but the switch in the off position is normal operation? I want a way that I can manually kick em on, but not 100% manual. My friend had 100% manual fans and I just know my dumbass would forget to turn em on sometimes
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Old 07-03-2007, 07:35 AM
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Originally Posted by theratdude64
So this way You can manually turn them on, but the switch in the off position is normal operation? I want a way that I can manually kick em on, but not 100% manual. My friend had 100% manual fans and I just know my dumbass would forget to turn em on sometimes
The diagram shown operates the fans just as you say. It gives you manual override, but allows normal, computer controlled operation with the switch not engaged.
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Old 07-03-2007, 02:07 PM
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Is this the same for OBDII as well?
I wouldn't mind adding this to my Z
Thanks,
Tal
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Old 07-06-2007, 02:22 PM
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not to try and hyjack this thread, but I did the same thing on my 96 Formula. I spliced in to the blue high speed wire, and only 1 fan came on! is one fan high speed, and the other low speed? thanks
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Old 07-06-2007, 02:32 PM
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Originally Posted by qboneus
Is this the same for OBDII as well?
I wouldn't mind adding this to my Z
Thanks,
Tal
Slightly different schematic, but basically the same.
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Old 07-06-2007, 02:33 PM
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Originally Posted by BMoney
not to try and hyjack this thread, but I did the same thing on my 96 Formula. I spliced in to the blue high speed wire, and only 1 fan came on! is one fan high speed, and the other low speed? thanks
That is because the way the relays and fans are wired. All 3 relays must be operated for both fans to run at high speed. If you can read a schematic, you will see why.
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