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Wanna Check My Fan Wiring ?

fireplug

fireplug

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Black fan operates via thermal switch

White fan operates via manual ON

Switch is ON (black fan)/OFF(both)/ON(white fan)

I believe this switch needs to be a DPDT three way switch correct?

With Thermal Switch ck5.jpg
 
fireplug said:
Black fan operates via thermal switch

White fan operates via manual ON

Switch is ON (black fan)/OFF(both)/ON(white fan)

I believe this switch needs to be a DPDT three way switch correct?
Click to expand...


Well, err, no. The "off" position ... would be, well, off. :crazy: That is, neither relay would get energized -- not both, as you are thinking.

If you want to control the fans individually, I think the easiest way to do it would be with two switches, SPST's.

One would go from the hot, through the switch, to the white fan's relay. (And, btw, on that one I'd run the hot from the battery, so you can run the fan with the key off, Just In Case :) ) That would be the manual fan.

The other switch would run from hot to the switch to the black fan relay, as the auto-on/off.

This way you can run both fans (both switches on), just the auto one (second switch on) or just the manual one (first switch on.) You can also kill both fans for water crossings with both switches off.

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Alternately, you CAN do it with a DPDT switch. Could even do the center off if you want to kill both fans for water crossings.

The functions would be ON (just one fan, presumably auto), OFF (optional) and ON (both fans.) This one you can't control both fans individually (A or B), just one (A or A+B.) Make sense?

This one I'd have to draw up, lemme know if you want that.

-- A
 
And oh yeah, the rest of the wiring looks good, except there's no ground on the switch. You'd only want to switch the hot sides of the wiring.

-- A
 
Why 60 amp fuses and relays?

My BIG Derale 4,000 cfm fans only draw a total of 50 amps together.

Most of the time these fans need 30 amps or less each.

Edit.

I see you are going to run dual windstar fans? That is a lot of cooling power.
 
dremu said:
Well, err, no. The "off" position ... would be, well, off. :crazy: That is, neither relay would get energized -- not both, as you are thinking.
-- A
Click to expand...

Im thinking the Off is to shut both fans off and not allow them to go on but not sure why. The temp switch will control the black fan and if he wants to bypass the temp switch he needs to switch around the temp switch.

I would think let the temp switch do its thing then use a SPST to turn on the white fan manually or a SPDT switch to turn on the white fan and bypass the thermal switch forcing both On.
 
88Silverado said:
Im thinking the Off is to shut both fans off and not allow them to go on but not sure why. The temp switch will control the black fan and if he wants to bypass the temp switch he needs to switch around the temp switch.

I would think let the temp switch do its thing then use a SPST to turn on the white fan manually or a SPDT switch to turn on the white fan and bypass the thermal switch forcing both On.
Click to expand...

Yeah, rereading the OP, I'm not clear on what was wanted, both on or off or what... so we'll wait for him to follow up ;)

-- A
 
as it is now, both fans can't be running at the same time ... I would also only run 50 amp fuses for the fans, you want it to fail before the relay...
 
88Silverado said:
Im thinking the Off is to shut both fans off and not allow them to go on but not sure why. The temp switch will control the black fan and if he wants to bypass the temp switch he needs to switch around the temp switch.

I would think let the temp switch do its thing then use a SPST to turn on the white fan manually or a SPDT switch to turn on the white fan and bypass the thermal switch forcing both On.
Click to expand...
Most guys like to turn both fans off manually for water or mud situations.
 
mrk5 said:
Most guys like to turn both fans off manually for water or mud situations.
Click to expand...

Yeah, I mentioned that ... but as Ryoken noted, they can't both be on, which would be good too.

::shrug:: Two SPST's is lookin' simpler and simpler ;)

-- A
 
dremu said:
Yeah, rereading the OP, I'm not clear on what was wanted, both on or off or what... so we'll wait for him to follow up ;)

-- A
Click to expand...

Great input so far. I really appreciate all the interest.

Ok the idea, sorry for not being clear, is;

Black fan or Primary will be operating through the thermal switch.

White fan or Secondary will be completely controlled manually via same switch ie. long climbs, or towing.

Both can be switched OFF for water crossings.

I was hoping that the switch (DPDT if I'm correct) will operate as such;

ON (primary only through thermal)

OFF (both)

ON (secondary or more accurately both)

Is that a better explanation?
 
ryoken said:
as it is now, both fans can't be running at the same time ... I would also only run 50 amp fuses for the fans, you want it to fail before the relay...
Click to expand...

Ok thanks for the heads up, I was actually going purely by the advice of the Ford guy I mentioned in the other post. Maybe he didn't think it through.
 
my 0ff/0n/0n switch is set up to run (ign fired) - off (both), prim fan on, prim on and sec thermally on
 
Crap, This all might be moot. I took a second look they might not have three position DPDT switches only two position...
 
I've been tossing around installing my windstar fans. I'm thinking about using a thermal switch for both fans. I've found fixed units on Summit with different ranges. I figure the just in case for the second fan would be excessive engine temp or failure of the primary which would result in the same excessive heat. So why not have that automatically controlled too just in case I'm not paying attention.
 
ryoken said:
my 0ff/0n/0n switch is set up to run (ign fired) - off (both), prim fan on, prim on and sec thermally on
Click to expand...

So on the highway you always have the Primary on unless you remember to turn it off? Not bad, but I'll never remember to do that. :D I guess it's no big deal though.
 
dremu said:
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Alternately, you CAN do it with a DPDT switch. Could even do the center off if you want to kill both fans for water crossings.

The functions would be ON (just one fan, presumably auto), OFF (optional) and ON (both fans.) This one you can't control both fans individually (A or B), just one (A or A+B.) Make sense?

This one I'd have to draw up, lemme know if you want that.

-- A
Click to expand...

I missed all this above ^ I stopped reading at the lines :doah:

That is exactly what I was hoping I had constructed LOL. Am I way off?

My thinking was that if the primary motor stopped working I could switch to BOTH. Yes power would be going to both but only the secondary would be working anyway.

AND if I needed extra cooling I'd hit BOTH again having two fans cooling.
 
yeah, I'd rather have it on consistently than it kicking off and on for wear and tear purposes on the motor and relay..
 
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