wiring 2 radiator fans

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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=131205
Printed Date: May 07, 2025 at 2:09 AM

Topic: wiring 2 radiator fans

Posted By: don2rz
Subject: wiring 2 radiator fans
Date Posted: April 17, 2012 at 5:22 PM

Is it safe to wire 2 radiator fans like this:

posted_image

* the fans were taken from a 2000 Acura Integra
* standard automotive 30A relay
* oem Toyota Tacoma switch

What wire guage should I use?

Replies:

Posted By: i am an idiot
Date Posted: April 17, 2012 at 9:27 PM

How big are the fans? Do you have any idea of their current draw at startup?

I would use one relay per fan, and delay one of the relays in order to not be so taxing on your charging system.

Posted By: don2rz
Date Posted: April 17, 2012 at 10:11 PM

The fans are 12" and 11".

I don't know their current draw, been searching this afternoon for more
info about the fan specs but wasn't successful.

I like the idea of using one relay per fan, but would like to use just
one switch to power both relays. How can I wire it this way? What wire
guage should I use?

Posted By: howie ll
Date Posted: April 19, 2012 at 3:15 AM

I'd run 2 x 40 amp relays with about 50 -60 amp fuses, use the top diagram with one relay per each fan.
Somewhere in there should also be a thermal (automatic temp switch) and an AC derived switch.
Oh look I've just eliminated your need for a fan switch.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

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