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how to wire in over ride for electric 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=138984
Printed Date: March 28, 2024 at 8:08 PM


Topic: how to wire in over ride for electric fan

Posted By: 83trekker
Subject: how to wire in over ride for electric fan
Date Posted: May 18, 2015 at 12:26 AM

I have a aftermarket electric fan kit for my early 80's chev 350. It has on the relay 1 wire for battery constant run through a breaker, 1 wire to the electric fan +, 1 wire to acc + when key is one, 1 wire to a thermostat in the head for the ground which is also the thermostat for the relay when engine hits 185f. Its a 40/60 amp relay.
The electric fan is grounded to the body.
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I am wondering how to wire in so I can turn the electric fan on anytime I want to help cool it, kind of like a newer vehicle when you turn the ac on it auto kicks on the fan on.

Im stumped any help would be great, thanks!



Replies:

Posted By: howie ll
Date Posted: May 18, 2015 at 2:12 AM
Join a wire to the thermostat wire, run it to a switch and ground the other side.
If you want illumination, 12V+ ACC to lamp, other side to joined wire.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.




Posted By: hotwaterwizard
Date Posted: May 18, 2015 at 8:55 PM
Yea just put a switch across the Thermostat.
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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !




Posted By: 83trekker
Date Posted: May 19, 2015 at 8:31 AM
worked perfect thanks all!





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