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  #1  
Unread 06-24-2017, 02:47 PM
Larry R's Avatar
Larry R Larry R is offline
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Default PWM for fans, will this work?

I am wanting to power and control my two Spal fans from my Holley HP ECU via a PWM controller (the Ford Fusion version) and have come up with a plan. I know this has been discussed at length in another post bout I would like to get some opinions as to whether or not this will work. Pictured below is a schematic I have hand drawn and a photo of what I have set up in the input/output of the ECU.
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File Type: jpg pwm plan 1.jpg (111.3 KB, 170 views)
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  #2  
Unread 06-26-2017, 10:06 PM
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I don't see why not. If I had AC I would use CTS and AC pressure as well.

Andrew
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  #3  
Unread 06-27-2017, 01:03 PM
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Quote:
Originally Posted by andrewb70 View Post
I don't see why not. If I had AC I would use CTS and AC pressure as well.

Andrew
Thank you. Larry
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Unread 06-29-2017, 09:57 AM
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Larry,

I just looked at the schematic again, and I would add a 40amp breaker between the battery 12v+ and the fan controller.

Andrew
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  #5  
Unread 06-30-2017, 05:45 PM
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Quote:
Originally Posted by andrewb70 View Post
Larry,

I just looked at the schematic again, and I would add a 40amp breaker between the battery 12v+ and the fan controller.

Andrew
Ok, I will. Thanks for your help. Larry
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Unread 06-30-2017, 09:07 PM
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Great time for this question, thanks for posting.
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Unread 07-01-2017, 02:51 PM
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Quote:
Originally Posted by Larry R View Post
Ok, I will. Thanks for your help. Larry
Why do you prefer the ford pwm over the Chevy? Is one that much better than the other?
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  #8  
Unread 07-01-2017, 04:00 PM
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Why do you prefer the ford pwm over the Chevy? Is one that much better than the other?
To the best of my knowledge, they are identical. I avoided the "Corvette tax" by purchasing my Ford Fusion units new off eBay, so my motive in getting the Ford modules was cost.

That said, when I hooked mine up today, including the 40 amp breaker, as soon as I connected the ground wire to the PWM, the fans came on. This is with the cold engine not running and the key off. I cannot yet say it is the fault of the PWM module or a wiring error, more research is necessary.

I hope Andrewb70 will step in here. Larry
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Unread 07-01-2017, 06:47 PM
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UPDATE!!! It works! After I fixed the wires I had inadvertently crossed, it works as advertised. My schematic is good. The fans came on as I had set them up in the input/output section of the ECU. I ran the A/C and it still maintained the prescribed temperature. My thanks to all who offered help and encouragement to me in this project. I will take it our for a freeway cruise soon to give it a real test.
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  #10  
Unread 07-01-2017, 09:50 PM
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For anyone that may want to do this in the future, do you have the part number for the controller you used?
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