3 way switch, e-fan wiring
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=141101
Printed Date: May 13, 2025 at 8:25 AM
Topic: 3 way switch, e-fan wiring
Posted By: dew1989
Subject: 3 way switch, e-fan wiring
Date Posted: March 29, 2016 at 2:47 PM
Hello,
I'm trying to figure out how to wire this up with no avail. What I'm trying to do is have a 3 way switch set up so I can run my 100% manual e-fan setup (one fan - off - two fans). The challenge I'm having is when the switch is on the 'two fan' setting, both fans need to turn on, but how do I wire this up so on the 'one fan' setting both fans don't turn on as well. Each fan is has independent wiring.
Thanks in advance
Replies:
Posted By: Ween
Date Posted: March 29, 2016 at 8:02 PM
So you are using a SPDT center off switch which triggers your fan relays? A diode connected across the outer terminals will give you a one/two fan operation. A 1N4000 series diode will work fine, assuming you are using bosch/tyco style relays.
Posted By: geepherder
Date Posted: March 29, 2016 at 8:57 PM
https://www.the12volt.com/installbay/forum_posts.asp?tid=140753
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Posted By: dew1989
Date Posted: April 01, 2016 at 3:26 PM
Thanks guys, this should do the trick!
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