Wiring an electric fan with a relay - Page 2 - Team Camaro Tech
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post #16 of 22 (permalink) Old Feb 15th, 12, 06:30 AM
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Matt
 
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Re: wiring a electric fan with a relay

I am getting ready to wire my electric fans and did some searching and found this thread. I want to wire it like post 11 diagram 2. But I have a question about this wiring diagram. It shows the dash switch relay terminal 85 to 87. That doesn't seem right. I would think 85 would be connected to 30. It looks like the poster Greg isn't around anymore. Can anyone else tell me if this is correct?

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post #17 of 22 (permalink) Old May 19th, 13, 05:25 AM
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Re: Wiring an electric fan with a relay

With it wired as shown, the dash switch will only serve to keep the fan running continuously once it is turned on by the temperature control. If you turn the dash switch off with the temperature circuit open, the fan will turn off and you will not be able to latch it on until the temperature circuit is closed and the fan is energized again.

If you connect 85 to 30, you will be able to turn the fan on at any time.

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post #18 of 22 (permalink) Old Feb 21st, 14, 11:28 PM
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Re: Wiring an electric fan with a relay

Ok!
I see it is an Old thread but!

I have drawn an example i think is better for you guys!



As you may see, i turned ewerything around, and im switching the GND to the Relay!
This gives a couple of advantages!
*GND is avalable ewerywhere
*If something goes wrong with wire (insulation fault/burnt hole) the Fans Starts instead of blowing the Fuse.
*Less wire to Run equils cleaner installation.
*Easy to hook up more switches to run fan (overheat frotection, EFI, cheap switches threaded into Engine with only ONE wire on it!

It goes like this:
On the +12v supply to relay from Battery i made an dotted line, if you make this Connection Fan will be functioning regardless of Ignition is ON or OFF!
If you choose to conect to Ignition, just do so (+ 12V switched power)

The GND for the Relay is now the switched part!
As you can see there is only ONE Wire out to Ground (less wire is good)
This wire you can connect to the Thermostat control, manual switch inside Car!
Some aftermarket EFI has an Output for Fan, (in my case FAST Ez-EFI)
This ECU goes to GND when activated!

The cheapest temp warning switches with only one wire goes to GND!

On the indicatorlight you can connect that to the same therminal, and oposite side to Illumination wire inDash (you can now controll brightness)


There is NO way of STOPPING the Fan now with Toggle switch!
(Cant see the point in that by the way)

http://www.fastmanefi.com/images/FAS...structions.pdf

Here is described how to hookup the Ez-EFI


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post #19 of 22 (permalink) Old Dec 11th, 16, 02:09 PM
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Re: Wiring an electric fan with a relay

Mounting the relay on the cord support. Where are you getting keyed power?

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post #20 of 22 (permalink) Old Dec 11th, 16, 02:47 PM
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Re: Wiring an electric fan with a relay

Quote:
Originally Posted by JC69RSZ28 View Post
Mounting the relay on the cord support. Where are you getting keyed power?
At the horn relay I think is where I got mine from.....been awhile now (or was it the voltage regulator)

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post #21 of 22 (permalink) Old Dec 11th, 16, 04:26 PM
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Re: Wiring an electric fan with a relay

Quote:
Originally Posted by DOUG G View Post
At the horn relay I think is where I got mine from.....been awhile now (or was it the voltage regulator)
The horn relay buss is not keyed power.

For your relay you'll want 12V from your fan control if you're using one. If you are turning on with a switch you can run 12V to the switch and out to the relay or you can run 12V constant power (tap the 12V constant wire) and switch the ground wire from the relay.
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post #22 of 22 (permalink) Old Dec 11th, 16, 04:48 PM
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Re: Wiring an electric fan with a relay

Quote:
Originally Posted by Vega$69 View Post
The horn relay buss is not keyed power.

For your relay you'll want 12V from your fan control if you're using one. If you are turning on with a switch you can run 12V to the switch and out to the relay or you can run 12V constant power (tap the 12V constant wire) and switch the ground wire from the relay.
It was either the voltage reg or horn relay ??? I can't remember, but one was hot with key on.
I must also say that I did the swap to a internal reg. alternator around the same time.

68 Camaro~LSx
Best to Date....and tuning
1.546 60'.....7.132 @ 94.43 660'.....11.327 @ 116.79.

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