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How do I know which lead is for which fan?

Old Nov 27, 2002 | 12:05 PM
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Twilightoptics's Avatar
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Car: '87 IROC-Z/'82 RX7
Engine: SBC 355/1.1L Rotary
Transmission: T56/5 Speed
Axle/Gears: 4.33/3.93
How do I know which lead is for which fan?

'87 305 IROC TPI. Dual fans. The wires have been cut and I'm wiring in something different. I want to know which wires are the ones that turn the 195 fan on and the 210 fan on. This way I can turn both on at 195.... and I'm putting in a separate set of relays to operate the fans off of a switch.
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Old Nov 27, 2002 | 12:18 PM
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Twilightoptics's Avatar
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From: Seattle, Washington
Car: '87 IROC-Z/'82 RX7
Engine: SBC 355/1.1L Rotary
Transmission: T56/5 Speed
Axle/Gears: 4.33/3.93
There are 5 wires coming from the loom/harness.... two orage (power), a green, a tan, and a black.

Is it the tan or the black or the green?

Last edited by Twilightoptics; Nov 27, 2002 at 12:23 PM.
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Old Nov 27, 2002 | 01:55 PM
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Attached Thumbnails How do I know which lead is for which fan?-fanrelaydiag.jpg  
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Old Nov 27, 2002 | 02:01 PM
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Attached Thumbnails How do I know which lead is for which fan?-fandiag.jpg  
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Old Dec 2, 2002 | 11:30 AM
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you can use can setup up the stock factory wiring and work from there..

i just spilced in a toggle switch so i can ground the relay(s) any time i want, and you dont even have to wire in any other relays at all.
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