dual electric fans ii

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8t6k5

Member - Posts: 10

Joined: March 08, 2013

Location: Arizona, United States

Posted: March 08, 2013 at 8:23 PM / IP Logged

Gentlemen,

A search of the internet for help in wiring 2 electric auto fans led me here:

https://www.the12volt.com/installbay/forum_posts.asp~TID~114321~PN~1~TPN~1

However, I would like a little more clarification on some of the diagrams provided. Unlike the OP, I prefer my fans on a manual switch; #1 Fan (Large) and #2 Fan (small-backup). Aditionally, I would like both fans to run automatically when the Air Cond. is on. Off with ingition off.

There is a diagram on pg. 4: https://www.the12volt.com/installbay/forum_posts.asp~TID~114321~PN~4~TPN~4 that I was planning on duplicating, only I would substitue the thermal switches to manual. However nothing is ever as easy as it seems so Im asking if that would be correct?

If I may throw a wrench in the plan, is there such a switch, rocker?, where say...left would be #1 ON - center both OFF - right both ON..... with the option of the A/C auto on?

As far as AC power its a basic GM 350 so the AC should be positive..?

Thank you,

JMG

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8t6k5

Member - Posts: 10

Joined: March 08, 2013

Location: Arizona, United States

Posted: March 08, 2013 at 8:26 PM / IP Logged

LOL, Ive been instructed to provide more vehicle info:

1986 Chevy K5 Blazer 4X4

Tune Port Injected 350 from 92' Z28

auto trans - AC....ect ect...

Installing Dual Ford Windstar Fans, 15" and a 13" single speed each, max 4400cfm

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Ween

Platinum - Posts: 1,366

Joined: August 01, 2004

Location: Illinois, United States

Posted: March 08, 2013 at 9:29 PM / IP Logged

you need:

1 SPDT center-off switch, 2 SPST or SPDT relays (40A contacts), 3 1N400* diodes. wire the input (center) of the switch to ignition, the output (outer) terminals to terminal 86 of the relays, one to each. ground terminals 85. connect one diode across the outer terminals of the switch, banded side of the diode to whichever relay is for the larger fan. this diode is for the single or dual fan selection. next take the other diodes, connect the banded leads to the terminal 86 of each relay. connect the non-banded leads together and connect to the AC system positive. this is for your auto-on with AC. terminals 30 connect to battery power, terminals 87 to each fan positive. don't forget to fuse your power wires.

all the diodes can be connected at the switch switch, just route one control wire to each relay. fuse the ignition feed to your switch also.

mark

8t6k5

Member - Posts: 10

Joined: March 08, 2013

Location: Arizona, United States

Posted: March 08, 2013 at 9:45 PM / IP Logged

Perfect...just about. Im still pretty green here.... I have all my accessories are on their own relay's, but have not quite grasped the concept of multiple relays or Diodes.

Meaning, I know what they are, look like, what they are supposed to do (I think)..but not how to install them, arrows are supposed to go with the current?

I drew the diagram out and it looks pretty simple..compared to what I was expecting.

Im lost with the banded side diode.... is that the small white marking on the diode?

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Ween

Platinum - Posts: 1,366

Joined: August 01, 2004

Location: Illinois, United States

Posted: March 08, 2013 at 9:54 PM / IP Logged

yes, the banded end is the marked end. think of the banded end as the point of the arrow, positive current flows to the point.

8t6k5

Member - Posts: 10

Joined: March 08, 2013

Location: Arizona, United States

Posted: March 08, 2013 at 10:11 PM / IP Logged

Ween wrote:

all the diodes can be connected at the switch switch, just route one control wire to each relay. fuse the ignition feed to your switch also.

mark

Not quite sure what you mean there.

Very crude, but I believe this is it.....

[IMG]https://i1359.photobucket.com/albums/q792/8T6K5/12VOLT_zpsc13f2a8f.png[/IMG]

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8t6k5

Member - Posts: 10

Joined: March 08, 2013

Location: Arizona, United States

Posted: March 08, 2013 at 10:12 PM / IP Logged

My Super Custom Signature....

8t6k5

Member - Posts: 10

Joined: March 08, 2013

Location: Arizona, United States

Posted: March 08, 2013 at 10:13 PM / IP Logged

Dunno why it wont show... you can copy/paste

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Ween

Platinum - Posts: 1,366

Joined: August 01, 2004

Location: Illinois, United States

Posted: March 08, 2013 at 10:18 PM / IP Logged

you'll have four wires at your switch; ignition, AC system, relay 1, and relay 2. ignition and AC accessible under dash, relay 1 and 2 under hood.

reverse the diode on your switch...should make primary come on, not secondary.

8t6k5

Member - Posts: 10

Joined: March 08, 2013

Location: Arizona, United States

Posted: March 08, 2013 at 10:21 PM / IP Logged

So switch will have 4 tabs too....or ignition/AC on same tab?

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