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12 volt fan question

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=11330
Printed Date: July 20, 2025 at 6:58 AM


Topic: 12 volt fan question

Posted By: jma5097
Subject: 12 volt fan question
Date Posted: March 23, 2003 at 3:33 PM

I was going to get a 12 v fan to help cool my amps.  I was woundering if anyone knows how to wire a 12 v fan?



Replies:

Posted By: bberman1
Date Posted: March 23, 2003 at 4:28 PM

To supply it with power you will want to use a SPDT relay. The relay will supply it with power and turn it on and off.  You will need to run a power wire from the battery to the relay. To turn it on and off you will connect the remote wire from the head unit. From the relay you will then run the remote wire # 30 on the relay to your fans and amps to turn them on and off. As far as a ground for the fans just tap into a ground source.

    Here is a diagram of how to hook it up 
87 - Constant 
86 : GROUND
30 - Remote Wire Accessories ( amps, fans etc) 
85 : Remote Input from HU 
87a: NOT USED
 

Here is some more info on the12volt about relays https://www.the12volt.com/relays/relays.asp


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