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Old 08-03-2010, 07:11 PM
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wiring diagram for dual fans

I'm looking for a diagram for dual fans with separate relays, works off of a temperature switch, (does it have one prong or two?) and has an override switch in the vehicle. RICKRACER's wiki diagram looks like my ticket. Can I just run the fan wires from the 87 terminals on the top two relays in his diagram?....I know his is for a two speed fan...but it looks like I can power two separate fans this way....thanks

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Old 08-03-2010, 07:24 PM
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Here is my favorite link.

http://www.classictruckshop.com/club...osch/relay.htm

Your sensor wire would switch the relay.
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Old 08-03-2010, 08:25 PM
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Is this what you want??


If you do not have AC----disregard the trinary wiring
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Old 08-04-2010, 12:36 AM
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Great help guys. No ac at this time. Question: so minus all the ac wiring, the toggle switch in the ON position will override the temp switch? Also, will the temp switch screw in to the intake and will have one or two prongs?
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Old 08-04-2010, 05:40 AM
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Toggle swich in the "ON" overrides everything and the fans will be on.

Either a one wire or a 2-wire switch in the intake or the head will work.
If a 2 prong---one of the leads will go a grounding point on the engine, and the other will go to the relays.

One wire is cleaner
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Old 08-04-2010, 07:29 AM
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Is there a relay and switch you would recommend?
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Old 08-04-2010, 10:39 AM
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Hwyhogg,
?, since there isn't any provision to have the fans come on at different temps I don't get why you are doubling up on fuses and relays. Both of your fans will come on at the same time anyway so why not just run both fans off of one relay? That's how I have mine wired and it works great.
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Old 08-04-2010, 11:08 AM
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The fans in my 59 draw a lot of power on startup
A single 30-40 amp relay would not live very long if it were top start both fans at the same time.

Also---why not go ahead and wire them separate----may need to down the line if he choses to get bigger fans.

I have a set of fans I bought back in the 80s that have a separate relay for each unit----came that way in the box, and these are only lil 10inch fans.
They sure keep the temps in the 79 C-10 with a 454 in check tho.
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Old 08-07-2010, 05:10 AM
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Well, I understand that one relay sized right would do the job, but I'm also a fan of redundancy. In the rare instance that the relay might go bad,(it happens), I would not lose both fans if I wire them separately.
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