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Cooling Fan Relay

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=143046
Printed Date: May 12, 2025 at 4:52 PM


Topic: Cooling Fan Relay

Posted By: timkins
Subject: Cooling Fan Relay
Date Posted: June 11, 2017 at 5:48 PM

I have an electric fan on my radiator that is switched by a relay. Today I melted a 30 amp fuse and the wire leading from the relay to the starter. I am a complete dummy when it come to the electrical and relays. The relay I am using is a 5 post relay with 86 going to the fuse panel. Post 85 goes to the starter with a 30 amp fuse in line,post 87a goes forward to the fan (I think) along with the post marked 30. I think the post marked 87 goes to ground I AM NOT sure. If someone has a diagram where all this goes I would appreciate it. If I wanted a manual switch where would it go along with an indicator light telling me the fan is on.



Replies:

Posted By: the12volt
Date Posted: June 12, 2017 at 8:40 AM
Connect as follows to have the fan come on when the ignition is on or when your switch is on:

85 to ignition 12V+ or switch
86 to ground
87 to fused 12V+
30 to fan positive
87a not connected to anything
Fan negative to ground


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