My Electric Fan swap

[macshemi57]

So I told myself I wouldn't start a thread on here until I actually built myself an electric fan. well her it is, one day I broke out the sheet metal and mocked myself up a littler homemade bender after a neighbor of mine gave me a fan out of a 2002 ford escort zr2. im pretty stoked to get thing on, the only thing in my way is wiring this thing, I know that it is a two speed fan and have a couple buddys who run this exact same fan in there ls powered rides. If anyone could shed some insight on getting this thing wired up it would be a huge help, I know id like it to controlled by an otrattw switch. ill put some part numbers of the fan it self up later this evening. I know its been a while since ive been on here, I have been very busy with my 4runner though, thanks for looking.

 

[macshemi57]

Reviving my old thread because I finally have the funds to finish this project up. While I plan on wiring the electric fan with the incorporation of the otrattw switch, I'm going to add a dual battery set up and a fuse block.
The Hope for this is to collect my battery isolater, switches, fuse block and related terminals by the end of the week. I already purchased the 0awg wiring and a 800w power inverter I plan on installing with this as well. StiSti looking for a little advice as to the best way to wire the fan itself

 

[IBallEngineer]

Reviving my old thread because I finally have the funds to finish this project up. While I plan on wiring the electric fan with the incorporation of the otrattw switch, I'm going to add a dual battery set up and a fuse block.
The Hope for this is to collect my battery isolater, switches, fuse block and related terminals by the end of the week. I already purchased the 0awg wiring and a 800w power inverter I plan on installing with this as well. StiSti looking for a little advice as to the best way to wire the fan itself

Use a relay like this:

http://i187.photobucket.com/albums/x303/octanejunkie308/59%20Apache/relaywiring.jpg

you can either use a manual switch or a temperature switch.

:couch2:

 

[jeff88]

Subbed! I want to do this myself. Is this fan going to be big enough to work (in terms of cfm)?

As far as wiring, I would have it auto controlled via temp. sensor. You can still have a switch if you want manual control, but this way you don't have issues with forgetting to turn the fan on.

That relay pic shows how to do it. If you wire the manual switch on the relay side of the thermo switch, then you have to leave the manual switch on to have the thermo work. If you wire the manual switch on the ground side of the thermo you have to have the coolant hot enough to have the fan on. Too cold and the manual switch won't turn on. If you run two relays, or wire the two switches seperatly into the relay, then they will work independently. There's pros and cons to all three options, just depends on what you want to do with your truck.

If you have an external trans cooler or plan to have one, then you should have a temp. sensor in the coolant and tranny fluid and then wire them seperatly to the fan. You shouldn't ever have the tranny fluid that hot, but just in case, especially if you tow or run the hills a lot.

Good luck and can't wait to see the final product!

 

[macshemi57]

Hey thanks again for that picture of the relay! I already have a external tranny cooler, it's the larger of one of the more common coolers here on the board. I live in Illinois and probably won't hassle witht wiring it into the tranny, yet..
I'm planning on having a thermo controlled sensor that goes directly into the coolant. Via upper radiator hose.
The reason for the switch is to have a manual on-auto-off. It will stay on auto-or thermo switch- most of the time. When I'm wheeling or running hot I have the option. For always on. And for water crossings and what not a always off.
any clue where I could find large relays as such?

 

[jeff88]

any clue where I could find large relays as such?

I had to put a relay for my headlights on my corolla once. I just picked it up off of Amazon. I don't have the link for the exact ones I got. It sounds like the fuse for your electric fan in an escort is 40 amps, so I would get a 40 amp relay, so you don't melt it.

Amazon: 40 AMP Relay

Also thought of another thing... you might want to setup a relay so that if the A/C comes on, the relay activates and turns your fan on. Most cars run the fan with the A/C on, so you might consider doing this too, at least maybe in the Spring after you get all of the kinks worked out.

EDIT: Amazon is nice enough to tell me that I purchased "this" item if I happen to come across the item page: My Headlight Relay. I'm still not sure why/how it has two different ratings for the amperage, maybe somebody here can shed some light on that.

 

[IBallEngineer]

I had to put a relay for my headlights on my corolla once. I just picked it up off of Amazon. I don't have the link for the exact ones I got. It sounds like the fuse for your electric fan in an escort is 40 amps, so I would get a 40 amp relay, so you don't melt it.

Amazon: 40 AMP Relay

Also thought of another thing... you might want to setup a relay so that if the A/C comes on, the relay activates and turns your fan on. Most cars run the fan with the A/C on, so you might consider doing this too, at least maybe in the Spring after you get all of the kinks worked out.

EDIT: Amazon is nice enough to tell me that I purchased "this" item if I happen to come across the item page: My Headlight Relay. I'm still not sure why/how it has two different ratings for the amperage, maybe somebody here can shed some light on that.

The Bosch type relay has two circuits for the load, a normally closed circuit rated at 40A which is ON until you activate the relay. And a normally open circuit rated at 30A which is OFF until you activate the relay.

For what its worth. I recommend spending a little more and buying an actual Bosch Relay

http://www.amazon.com/Bosch-332209150-Relay/dp/B0010AH6YM/ref=sr_1_2?ie=UTF8&qid=1418085089&sr=8-2&keywords=bosch+relay

Some auto parts store have good quality Standard Ignition relays which I use as well. I have bought hundreds of these things, some for as little as $1. And those weren't even worth that. Choose wisely.

Also, there is no need to had a second relay if you just want to have the over ride off feature. Turning it on and having the ability to lock out the temp switch gets more complicated.

:drama:

 

[macshemi57]

The Bosch type relay has two circuits for the load, a normally closed circuit rated at 40A which is ON until you activate the relay. And a normally open circuit rated at 30A which is OFF until you activate the relay.

For what its worth. I recommend spending a little more and buying an actual Bosch Relay

Amazon.com: Bosch 332209150 Relay: Automotive

Some auto parts store have good quality Standard Ignition relays which I use as well. I have bought hundreds of these things, some for as little as $1. And those weren't even worth that. Choose wisely.

Also, there is no need to had a second relay if you just want to have the over ride off feature. Turning it on and having the ability to lock out the temp switch gets more complicated.

:drama:

Hey thanks for the link. I spoke to Jim from otrattw woods today and he mentions using a dpdt switch in effort to accomplish what I'm going for here.
Are you saying it's not worth the headache to have the override on portion? Just use a switch for auto and manual off?
The switch uses two leds. My plan is to use on always on to light the rocker itself and one as the indicator light using the "window" on the rocker itself.

 

[IBallEngineer]

Hey thanks for the link. I spoke to Jim from otrattw woods today and he mentions using a dpdt switch in effort to accomplish what I'm going for here.
Are you saying it's not worth the headache to have the override on portion? Just use a switch for auto and manual off?
The switch uses two leds. My plan is to use on always on to light the rocker itself and one as the indicator light using the "window" on the rocker itself.

If it's worth it to you, it's worth it. So you want to be able to turn it ON when you want? Or turn it OFF when you want? Because you can't do both and have the temp switch, from one relay. In fact I really have to think how to do it at all, let me get some coffee in me first.

:ranger:

 

[macshemi57]

Ideally I would like to do it both from one switch. I just wouldn't know how to wire the '8 pin' switch with multiple relays. If it isn't doable then I would settle with a auto-off switch, with an integrated indicator light.
I'm gunna give otrattw another call today, this is gunna take some thinking
Thanks again for your input man, I really appreciate it:hello:

 

[macshemi57]

If it's worth it to you, it's worth it. So you want to be able to turn it ON when you want? Or turn it OFF when you want? Because you can't do both and have the temp switch, from one relay. In fact I really have to think how to do it at all, let me get some coffee in me first.

:ranger:

What you think of this?

 

[IBallEngineer]

What you think of this?

I like it, but it won't turn OFF and ON via the over ride switch that way either. The second relay gives you the automatic activation with the A/C but that's it. Again if you want one switch to over ride both OFF and ON it's more complicated. You can ask Jim at OTTRW if he has an ON-OFF-ON that would give you the LED indicator you want, but I don't think he has it. That way up would be ON, middle would leave it to the temp switch, down would be OFF over ride. With a simple ON-OFF switch, that is really all you can do, even double pole double throw wouldn't work. Now if you use a latching relay I might be able to have it either latch or unlatch the circuit based on whether or not the fan was on or off. But we'd need more relays too. Or you could just add a second over ride switch and have it break the ground circuits to the relays and it would not allow the fan to run no matter what. If this is for water crossings, you could hide the switch and use an LED indicator in the dash somewhere so you don't forget you have the fan locked out. Also the LED in that diagram isn't necessary if your switch has one in play.

Clear?

:loco:

 

[macshemi57]

I like it, but it won't turn OFF and ON via the over ride switch that way either. The second relay gives you the automatic activation with the A/C but that's it. Again if you want one switch to over ride both OFF and ON it's more complicated. You can ask Jim at OTTRW if he has an ON-OFF-ON that would give you the LED indicator you want, but I don't think he has it. That way up would be ON, middle would leave it to the temp switch, down would be OFF over ride. With a simple ON-OFF switch, that is really all you can do, even double pole double throw wouldn't work. Now if you use a latching relay I might be able to have it either latch or unlatch the circuit based on whether or not the fan was on or off. But we'd need more relays too. Or you could just add a second over ride switch and have it break the ground circuits to the relays and it would not allow the fan to run no matter what. If this is for water crossings, you could hide the switch and use an LED indicator in the dash somewhere so you don't forget you have the fan locked out. Also the LED in that diagram isn't necessary if your switch has one in play.

Clear?

:loco:

Ok so official decision is....
Only using a switch for auto-override off. It's to complicated to do the three way switch in one unit.
With the above diagram I plan on having the thermo switch and ac activation to turn ON and pushing the switch down will over ride OFF the entire unit.
as for the indicator light, the lower led of the switch will come on and be visable through the window of the rocker. Does this sound like it should work?

 

[macshemi57]

So now that this is established
am I looking for a spst, dpst, or dpdt switch? Also I'm gunna 're draw this diagram and see if you guys like what you see

 

[IBallEngineer]

Ok so official decision is....
Only using a switch for auto-override off. It's to complicated to do the three way switch in one unit.
With the above diagram I plan on having the thermo switch and ac activation to turn ON and pushing the switch down will over ride OFF the entire unit.
as for the indicator light, the lower led of the switch will come on and be visable through the window of the rocker. Does this sound like it should work?

OK, I think this should be easy, except the Carling rockers are designed to depress the upper portion to activate, you can flip it over but the lighting would be backward. I'll ignore the direction of activation for now. SPST should be fine for this, since we are only deactivating on circuit. Now I need to know what switch you choose and I can pin it out for you easily. VSV, VJS, etc. Once you pick it, let me know what it is and I'll solve that for you.

OK, rethinking this, if we are breaking a circuit the switch would be ON normally, and off to function, but that makes it hard to light the light. Let me look at the switches and get right back to you. I used to have all the diagrams on my other computer, before the Kryptolock virus ate it up.

:doh:

 

[IBallEngineer]

OK, I think this should be easy, except the Carling rockers are designed to depress the upper portion to activate, you can flip it over but the lighting would be backward. I'll ignore the direction of activation for now. SPST should be fine for this, since we are only deactivating on circuit. Now I need to know what switch you choose and I can pin it out for you easily. VSV, VJS, etc. Once you pick it, let me know what it is and I'll solve that for you.

OK, rethinking this, if we are breaking a circuit the switch would be ON normally, and off to function, but that makes it hard to light the light. Let me look at the switches and get right back to you. I used to have all the diagrams on my other computer, before the Kryptolock virus ate it up.

:doh:

This is the first time I'm quoting myself! But yes I can do it. The OTRATTW switches I looked at don't allow me to activate the lower light when in the DOWN position. Basically if we are turning something OFF, the light will be OFF as well.

We could flip it over and use a relay to activate the UPPER light, which will be on bottom, but now the activation direction will be inverted, so DOWN would be the ON position.

No worries, we just have to add a 3rd relay, I'll draw it for you. But PLEASE tell me what switch you want to use first.

:whip:

 

[macshemi57]

The direction of up or down as to what is auto-and off. Doesn't bother me really. As long as one led is on at all times, so I can see it at night, I'm all cool with it. Thanks again for the help!
So I thought I'd throw this in here also. I found this diagram and found it fitting since this is a 2 speed fan. (Same as tiaras fan). It Iould require two temperature probes, I could have a high speed switch and a auto-off switch. I would then put the input from the ac clutch to the low speed relay

 

[macshemi57]

I'm determined to making this work out, there are a few threads on here hanging around, it would be nice to have a go-to e-fan write up for clarification on switch selection,relay wiring, and dual speed fans, thanks for all the help

 

[IBallEngineer]

The direction of up or down as to what is auto-and off. Doesn't bother me really. As long as one led is on at all times, so I can see it at night, I'm all cool with it. Thanks again for the help!
So I thought I'd throw this in here also. I found this diagram and found it fitting since this is a 2 speed fan. (Same as tiaras fan). It Iould require two temperature probes, I could have a high speed switch and a auto-off switch. I would then put the input from the ac clutch to the low speed relay

I don't see the diagram.

OK so you want a light to FIND the switch, that is easy on a two light switch you just power the light with your dash light circuit and ground the other terminal. I was thinking you wanted to light the light when you turned off the fan! Which I think you should, otherwise you might forget you have it turned off and overheat the engine. I'll look at the diagram if you get it posted, but you keep losing me on what it is you actually want. Pretend you are talking to a small child, and break it down thoroughly when you explain.



:ybrick:

 

[IBallEngineer]

I'm determined to making this work out, there are a few threads on here hanging around, it would be nice to have a go-to e-fan write up for clarification on switch selection,relay wiring, and dual speed fans, thanks for all the help

Beautiful circuit! But once again, it won't do what you want. The switch is an override to ON, not OFF. And there is no light in the switch, they are using two separate LEDs to indicate which fan is operating.

You can use that circuit with the switch breaking the fused Ign 12V, and light it via the dash lights, but the indicator light in the switch won't work, unless you use a 3rd relay.

:frusty::frusty::frusty: