fan relay on 85 chevy k10

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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=108946
Printed Date: May 10, 2025 at 1:58 AM

Topic: fan relay on 85 chevy k10

Posted By: shaggs87
Subject: fan relay on 85 chevy k10
Date Posted: November 15, 2008 at 8:35 PM

I just installed a dual radiator fan in my 85 chevy truck, and I am not sure if I wired the relay correctly. I followed an example I found in this forum, but I blew a 15amp and a 20 amp fuse already. Here is how I wired it: 85 - Toggle Switch, 86 - Ground and (-) Fan, 30 - 12v(+) and Toggle(+), 87 - Fan(+)

I did wire both fans together, and am wondering if I need to use two relays, one for each fan? Thanks in advnace for any help!

Replies:

Posted By: i am an idiot
Date Posted: November 16, 2008 at 6:22 AM

It is common for those fans to pull tons of current at startup. You should use one relay per fan. There is somewhere on this site a simple diagram for a delayed on relay, it uses a resistor and a capacitor to delay the turn on of the relay for a half of a second, it will help out with the high current at startup. I just do not remember the values of the cap and resistor. Maybe someone knows where the diagram is located.

Posted By: shaggs87
Date Posted: November 16, 2008 at 11:41 AM

Thanks for the help, i will try using a second relay today. And i will search the site for the diagram you mentioned.

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