electric 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=128771
Printed Date: May 19, 2024 at 12:02 PM

Topic: electric fan relay

Posted By: rhythmicnoise
Subject: electric fan relay
Date Posted: October 09, 2011 at 8:38 AM

I'm putting an electric fan in my 90 RX-7. It's using a thermoswitch as well as a manual override switch. Is this diagram correct?

posted_image

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1989 Mazda RX-7 vert-JDM swapped engine
Eclipse CD5425
Boston Pro 6.5 comps in doors
Boston Pro 5" mids in the dash
Boston Pro 8"
JL Audio 300/2
Zapco Studio 150
Alpine 4ch amp that came with t

Replies:

Posted By: i am an idiot
Date Posted: October 09, 2011 at 9:33 AM

If you are sure about pin 10 of the ECU, all looks good.

Posted By: rhythmicnoise
Date Posted: October 09, 2011 at 9:41 AM

I actually haven't wired in the idle up yet. It's a fresh rebuilt engine with a drivetrain swap, aftermarket gauges, efan, etc. Once everything is up and running I'll go back and splice in the idle up.

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1989 Mazda RX-7 vert-JDM swapped engine
Eclipse CD5425
Boston Pro 6.5 comps in doors
Boston Pro 5" mids in the dash
Boston Pro 8"
JL Audio 300/2
Zapco Studio 150
Alpine 4ch amp that came with t

Posted By: bluesplyr
Date Posted: September 14, 2012 at 6:49 PM

My first post...hope its not my last :-)

I would like to do the same to my 250cc scooter, but would like to wire it hot with 12V power from battery to pin 85, bypassing ignition switch. My concern is: would this cause a drain on my battery as coil would always be energized.

Posted By: i am an idiot
Date Posted: September 14, 2012 at 8:20 PM

If 12 volts is on 85, and ground is on 86, then yes this will drain your battery. What kind of powerplant do you have on that beast that requires cooling when the key is off?

Posted By: bluesplyr
Date Posted: September 14, 2012 at 8:36 PM

Mr. Platinum,

Powerplant is stock 260cc, but made in another country beginning with C. I would like to have the option of turning on fan if necessary, although i've not had any problem so far with overheating. posted_image I have all the wiring, 12 gauge, in place and trying to avoid fishing wire to ignition. Is my only solution connecting to ignition which i'm trying to avoid...not a kid anymore. Also, should I use the hookup posted by rythm.

Posted By: i am an idiot
Date Posted: September 14, 2012 at 9:15 PM

Yes you can use his diagram. If the switch is in the off position, it will not be draining your battery.

Posted By: i am an idiot
Date Posted: September 14, 2012 at 9:54 PM

If you do not want to go to the ignition switch, you could always go to the tail light for switched power.

Posted By: oldspark
Date Posted: September 14, 2012 at 11:17 PM

bluesplyr - if your GND is thru a temperature switch (as per rhythmicnoise's diagram) then the relay won't be energised at low temperature.

Posted By: bluesplyr
Date Posted: September 17, 2012 at 3:06 PM

Before you tell me how wrong I am, I want to thank everyone for their superb advice.

Now, if I apply 12V to lead 85 with 86 on a spst switch before connection to - side of thermoswitch.... will I accomplish what is needed. I only want this fan switch in an emergency, if for any reason i'm caught in the Outback on a hot summer day...r posted_image estaurant that is...:-)

Posted By: bluesplyr
Date Posted: September 17, 2012 at 4:07 PM

And 30 to ground