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I want to put a LED to see when my fan is running...

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Old Jun 11, 2002 | 02:00 PM
  #1  
stuart69427's Avatar
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From: Fort Belvoir, VA USA
Car: 94 Camaro
Engine: 3.4L
Transmission: 4l60e
I want to put a LED to see when my fan is running...

I read the Tech article a while back and the next day I bought the Hayden Fan switch that was listed.

I got that one becuase i wanted to be able to switch between the Hayden and Stock at the flip of a button.

Now I haven't finish installing this just quite yet.

Where do I put a LED to tell when it is on? the book tells me to put it on the a/c clutch but to me that tells me that it will tell me only when the A/c is turning the fan on. What do you think?

Anybody have a diagram or anything?

Hold on while I get some more info...
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Old Jun 11, 2002 | 02:21 PM
  #2  
stuart69427's Avatar
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From: Fort Belvoir, VA USA
Car: 94 Camaro
Engine: 3.4L
Transmission: 4l60e
Hayden makes a fan turn-on relay (part no. 3652). Available at Pep Boys for about $25.

Features:

Thermal switch mounted in radiator.
Fan turn-on at 185° and off at 170°.
Can be wired to augment factory switch, not replace it.
That's what the article says, but the paperwork I got with the switch says its temps are On 186 and Off at 164, so I go with the paperwork it came with.

https://www.thirdgen.org/newdesign/tech/cool.shtml

How would I wire this up?

I want to have a witch to switch between stock and Hayden (AUTO)

I want a switch to maunally turn the fan on (FAN)

I also want the LED to to display when the fan is on

Also what resistors will I need to install the LED, if any?
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Old Jun 12, 2002 | 03:34 PM
  #3  
Blackened's Avatar
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I would wire up the LED to the fan leads directly or you can do it at the relay on the firewall. Just install it in parellel with the fan. Use a 600 ohm resistor or so.
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Old Jun 13, 2002 | 10:47 AM
  #4  
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From: Maryland; USA
Yeah once the fan is moving the circuit for that fan is complete, therefore current is flowing through and u can just splice into the two fan wires and hook the led up to that. I think that would work, someone tell me if i am wrong.
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Old Jun 13, 2002 | 02:10 PM
  #5  
Willie's Avatar
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From: Tucson, Arizona USA
Car: 1987 Z28 Convertible
Engine: 305 TPI
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If you have ANY questions about anything that's written in the article, why don't you e-mail the author like the article says? BTW, I wrote the article.
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