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dual speed car fan

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=127059
Printed Date: May 05, 2025 at 1:11 AM


Topic: dual speed car fan

Posted By: shabbadabba
Subject: dual speed car fan
Date Posted: April 22, 2011 at 10:59 AM

im getting rid of my viscous fan for an electric fan.

the fan i have is a 3 wire 2 speed fan

i have the radiator switch to match,also 3 wire

now ive bought 2x 40amp 4 pin relays (spno type)

can i just wire 2x ignition feeds,a wire to the fan and a switched earth from the fan switch,do this for both fan speeds?




Replies:

Posted By: oldspark
Date Posted: April 22, 2011 at 11:17 AM
As in battery thru fuses thru relays to fans' +12V, and IGN +12V to relay coils with other side to grounded switch(es), yes.


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