Electric fans

here is a krusty schematic to illustrate how mine are ran. I run dodge intrepid fans which i think are superior to cli-taurus fans because they are a dual fan set-up with a shroud that fits scout radiators perfectly and are thin, plus the twin set-up allows to set a fan motor on either side of the water pump pulley. I am controlling the ground side of the relay like the factory does and right now the temperature switch I am running is a factory 210 or whatever that is hotter than i would like it to be. If I ever get the scout running again, I will buy a low temp one from jeg's or some place. I use the big round GM relays for everything electrical because they are easy to "obtain" with the connectors from any jy, and are at EVERY parts store, and I can carry one spare for everything, lights, fuel pump, fans, etc...

my jeep did seem to have better take off but i dont know for sure if it gave me anymore horses and i had my alterator built up by a place in OKC they made it 150 amps for $50 but i guess that doesnt help since we are in college station.

OK - I searched. Gonna put an electric fan on my truck. Relatively soon, as my fan clutch isn't doing much and it is going to get warm soon. I have a fan already. I have a 135 amp alternator, so that's stayin. I've got wiring, or at least know what and where to get it. Of course, I'm lookin for a good deal, and also dependable.

Somewhere on here or maybe FSB, I saw a link to a guy selling prefab harnesses. Anyone know what I am talking about? Frick? Will? John Brown?

So I know I am going to need a relay or solenoid. I am not real great at reading wiring diagrams, but once I have it in my hands I am ok. I would like the fan to use temp only to turn off and on. Since it is a single, I don't even know that I want it to automatically come on with the AC. Just on at 185ish, and off at 170.

The biggest thing I don't know about is the sensor and fan control box. I know there is debate on where to put the sensors that stick in the radiator, but are there sensors that go in the thermostat housing instead?

I have looked around for good write-ups, and have not found anything great yet, if anyone knows of one, it would be appreciated.

I am sure when I am done with this, I will realize how simple it is, but I am trying to get my bases covered so my truck is not down for more than a saturday.

Use this to wire up your relay.

http://www.jegs.com/webapp/wcs/store...53117_-1_11471

Seth, on Mike Mike Knoellers bronco we tried setting up a chip to use the built in eec-iv fan control thats normally disabled on trucks. I don't know how it ended up for him since he had some other problems, but in theory you could do the same and not mess with those fan temp control things. Then you would just run the fan control wire that you would have to add to the harness (not hard, and I think oreillys sells the pins in the helpme section) that grounds the relay that controls the fan.

Flem - let's do it. Maybe in three weeks?

ok, but theres a catch. you have to buy some chit. It might be cheaper to do the auxiliary sending unit, but I think this way is more reliable.

http://www.moates.net/product_info.p...roducts_id=101

or if you can find any other "chip" for a ford of that vintage it will work, we can hack it up and socket it to take an eprom.


Hey do they have any female spade connectors at work that are smaller than 1/4"? Think you could tell me how much a pocket full of them weighs? I'm curious.

The idea of the chip is cool, and doesnt look to be much more. I know if anyone I know can make it happen, it's gonna be you.

Flemco in a Ford, say it aint so....

He's a bit of an eec-iv guru.

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Originally Posted by Seth

He's a bit of an eec-iv guru.

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I know, I was just jealous cause I got's no cool wiring in da cheby. :(

Maybe I get him to help me when I go 8.1/zf6. :eek:

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Originally Posted by DRAGOONRANCH

Flemco in a Ford, say it aint so....

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I think it all started on a crappy f150.

Nah, I think it all started with Flem and I laughing our asses off at a North Texas Binders meeting where this scout douche was bragging about his fuel injection with his system with the knock sensor screwed into the valve cover breather hole. I think we did Lurch before the F150, but I don't really remember...we did a lot of drinking during those.

Flem they sell 3/16" male and female spade connectors at napa.

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Originally Posted by Fredo

Nah, I think it all started with Flem and I laughing our asses off at a North Texas Binders meeting where this scout douche was bragging about his fuel injection with his system with the knock sensor screwed into the valve cover breather hole. I think we did Lurch before the F150, but I don't really remember...we did a lot of drinking during those.

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Lurch was first, but we had been talking about doing it way before we saw bill's pile, and I think we actually had some parts and schematics.

Would a starter solenoid handle efans, or would it not handle constant loads?

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Originally Posted by Seth

Would a starter solenoid handle efans, or would it not handle constant loads?

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I was reading a book in evans that had the formulas to calculate relay ratings.

I can't remember the formulas, but I came to the conclusion that if it can handle 600amps for 30 seconds, 50 amps forever should not be a problem

I've seen some guys use ford style solenoids to control fans, but I'm a big fan of relays. In my mind, a starter solenoid wasn't designed for a constant load. If you are running two fans, I would recommend two relays. I used to have one 40amp relay on my camaro fans and it melted down a relay when one of the fan motors let go while cruising in Detroit for the Dreamcruise. So basically, it worked, but if one fan motor fails and takes out the relay, the other one goes down too. The reason I made this mistake on the camaro was because from the factory, the RS models only had one large cooling fan with one relay, while the Z28's had two fans with two relays which I didn't realize, so I put the dual fan setup on and just wired them both to the same relay not knowing any better. With that said, I made the same mistake on Lurch when I setup those fans, but I have been too lazy to do anything about it. I've lost a fan motor on Lurch too, but got lucky that it didn't take out the relay and just simply unplugged the offending motor and made it back to the AA in clayton on one fan. So, it all basically comes down to redundancy.

I am planning on running a single fan. I guess I can just look up whatever the stock app used and buy that one. Is a 40 amp good for the start up surge?

I have windstar dual fans with ghetto-riffic 30 amp relays in pigpen. A single 30 amp relay per fan is not enough, on my suburban I had one relay per fan and the fans killed relays occasionally. On pigpen, I have two relays wired in parrallel per fan. Its ghetto, but its hella cheaper than a single 50-60 amp relay per fan.