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fan relay on 85 chevy k10


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shaggs87 
Member - Posts: 2
Member spacespace
Joined: December 25, 2007
Location: New Mexico, United States
Posted: November 15, 2008 at 8:35 PM / IP Logged  

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!                       

i am an idiot 
Platinum - Posts: 13,667
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: November 16, 2008 at 6:22 AM / IP Logged  

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.

shaggs87 
Member - Posts: 2
Member spacespace
Joined: December 25, 2007
Location: New Mexico, United States
Posted: November 16, 2008 at 11:41 AM / IP Logged  
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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