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Old 01-31-2012, 07:51 PM   #1
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Electric fans

If I swap out my fan clutch for electric fan would I have to replace my alternator? Any sites or info on a electric fan conversion would be cool. Thanks
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Old 01-31-2012, 08:06 PM   #2
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Quote:
Originally Posted by Meansaleen
If I swap out my fan clutch for electric fan would I have to replace my alternator? Any sites or info on a electric fan conversion would be cool. Thanks
If you still have your stock alternator I would highly recommend upgrading to a 130 amp.
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Old 01-31-2012, 10:11 PM   #3
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Re: Electric fans

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Originally Posted by Meansaleen View Post
If I swap out my fan clutch for electric fan would I have to replace my alternator? Any sites or info on a electric fan conversion would be cool. Thanks
Yes, an alternator upgrade would be advisable.


Electric Fan Conversion


Note: Use 70 Amp relays. Even though the fans may say they only pull 30 Amps, the start up amperage is much higher and will burn up smaller amperage relays rather quickly.
You may also need to install a one way diode at the fan motor to keep it from back feeding into your electrical system when the fan is shut down.
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Old 02-02-2012, 08:47 PM   #4
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Thanx Trojan
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Old 02-02-2012, 11:16 PM   #5
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So what about using a fan off a 94 gt?
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Old 02-03-2012, 06:28 AM   #6
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Re: Electric fans

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So what about using a fan off a 94 gt?
You could do that too.
However, using a 2 speed fan such as those on the 94-95 Mustangs leaves you with a choice of just using the high speed circuit of the fan motor or trying to figure out how to use both circuits.
I did quite a bit of research some time ago toward using the SN95 fan on my 86 GT.
Finding a thermostat and relay system for a 2 speed fan other than what was used on the SN95's was impossible then. Maybe now there is something available, I don't know.


I initially looked at using the SN95 controls, but it quickly became apparent that the older 89-93 ECU's did not easily lend themselves to interfacing with that type of control, some would not work and the SN95 system was not that great anyways, being subject to a recall for possible burned up wiring and fire.


At that point I sat down and tried to figure out how to wire up the system myself.
What I ended up with is a bit complicated, but it looks like it will work to me.
I tried to get verification of my wiring design from several engineers and automotive wiring sites, but the best I could get out of them was, "It looks like it will work".

That wasn't very helpful to me at the time though, because I think it will work too and I was looking for verification, which none of them would confirm. Needless to say my faith in their abilities was somewhat shaken.

Here is a copy of what I came up with. I make no guarantees and use at your own risk.
I believe there are enough safeties built in to protect a 12 volt system, but you never can be 100% sure until it has been thoroughly tested.
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Old 02-03-2012, 09:34 AM   #7
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This is what I used.and since its adjustable I can dial my temp in very easily.its 40 $ at summit.I wired it to the high speed.it works great and very easy to install.
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Old 02-03-2012, 10:26 AM   #8
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Re: Electric fans

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Originally Posted by dreamstang View Post
This is what I used.and since its adjustable I can dial my temp in very easily.its 40 $ at summit.I wired it to the high speed.it works great and very easy to install.
I looked at possibly using two of those with my homemade system.
Decided to try and find one controller with two circuits, no luck then, but there may be one available now.


Did you wire in a HD 70A relay before the thermostat switch to run the fan power through?
If not, running the fan on high speed will eventually kill the switch because the fans power draw spikes way above 25A on start up.
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Old 02-03-2012, 10:33 AM   #9
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Thanks guys i noticed ot was 2 speeds but didnt think anything about it... A friend pretty much gave it to me so i was gonna try it
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Old 02-03-2012, 11:31 AM   #10
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Quote:
Originally Posted by Trojan Horse

I looked at possibly using two of those with my homemade system.
Decided to try and find one controller with two circuits, no luck then, but there may be one available now.

Did you wire in a HD 70A relay before the thermostat switch to run the fan power through?
If not, running the fan on high speed will eventually kill the switch because the fans power draw spikes way above 25A on start up.
It comes with an hd 40/60 amp relay.I don't remember how I wired it,just wired it per instructions.if u want I can upload schematic when I get home.
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Old 02-03-2012, 11:36 AM   #11
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Re: Electric fans

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It comes with an hd 40/60 amp relay.I don't remember how I wired it,just wired it per instructions.if u want I can upload schematic when I get home.
Yeah, I'd like to see how they wire it.
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Old 02-03-2012, 12:28 PM   #12
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This is the one.there is a PDF instruction sheet .

http://m.summitracing.com/parts/DER-16749
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Old 02-03-2012, 01:55 PM   #13
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Re: Electric fans

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Thanks for the link.
I'll add it to my files for future reference.
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Old 02-03-2012, 01:58 PM   #14
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Originally Posted by Trojan Horse

Thanks for the link.
I'll add it to my files for future reference.
No problem!
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