Topic: Electric Fan Installation

[sharpxmen]

If I understand you correctly, you are trying to wire your fan up so that the slow speed is setup like the diagram, but with the option of turning on the high speed manually with the other position on your switch.
If that is what you are trying to do, you need to have a second relay activated by the switch allowing current to flow from the battery through the relay to the high speed wire for the fan. The power should not be going from the battery through the switch to the fan.

i also don't understand what he meant

I got it figured out how to put a switch in to turn the fan on manually.
I have the switched power (in the diagram) going into an on off on toggle switch.
Everything else I have wired just like the diagram.
I have the power going from the toggle switch to the fan.
I want to use another relay so I don't overload the toggle switch.
How do I wire the relay in?
before or after the toggle switch?
Thanks,
Vance

if you wired everything like the diagram i would guess (but still confused by the conflicting statements you made) that you have a relay already in. If you are not planning to use a thermostat then put your switch in the same place as the thermostat in the diagram, keep everything else the same and that is how you integrate the relay (the one that is pictured there is the only one you need - the terminals on the relay are labeled so you can't go wrong). the switched 12v with a 1A fuse is low current so that's how you isolate the high current (amperage) circuit going to the fan, you don't need a second relay. If you want to have both a switch and a thermostat _DO_NOT_ put them in series (you said you put the switch on the 12v switched - the 12v switched means is from the ignition, so you only have power when your key is in RUN position) - you can have the switch in parallel with the thermostat if you want to override it (so you can turn it on earlier or if your thermostat fails). If i were you i would stick with that diagram, it is the way you should wire your fan anyway and you can enhance it later once you got this figured out.

It would help though if you draw what you meant so we can see how you wired your fan, it's pretty hard to understand based on your explanation - as you can see neither St.Chevrolet nor I could figure out for sure what you meant - so draw a diagram and take some pics (you could also take pics of your istalled fan and wiring, that would help too).

[st.chevrolet]

i also don't understand what he meant

if you wired everything like the diagram i would guess (but still confused by the conflicting statements you made) that you have a relay already in. If you are not planning to use a thermostat then put your switch in the same place as the thermostat in the diagram, keep everything else the same and that is how you integrate the relay (the one that is pictured there is the only one you need - the terminals on the relay are labeled so you can't go wrong). the switched 12v with a 1A fuse is low current so that's how you isolate the high current (amperage) circuit going to the fan, you don't need a second relay. If you want to have both a switch and a thermostat _DO_NOT_ put them in series (you said you put the switch on the 12v switched - the 12v switched means is from the ignition, so you only have power when your key is in RUN position) - you can have the switch in parallel with the thermostat if you want to override it (so you can turn it on earlier or if your thermostat fails). If i were you i would stick with that diagram, it is the way you should wire your fan anyway and you can enhance it later once you got this figured out.

It would help though if you draw what you meant so we can see how you wired your fan, it's pretty hard to understand based on your explanation - as you can see neither St.Chevrolet nor I could figure out for sure what you meant - so draw a diagram and take some pics (you could also take pics of your istalled fan and wiring, that would help too).

Sharpxmen for some reason your quote does not show all of my reply. And for some reason, I'm not sure why, I thought we were discussing a 2 speed Taurus fan not a single speed, my bad.

[haulincats]

If I understand you correctly, you are trying to wire your fan up so that the low speed is setup like the diagram, but with the option of turning on the high speed manually with the other position on your switch.
If that is what you are trying to do, you need to have a second relay activated by the switch allowing current to flow from the battery through the relay to the high speed wire for the fan. The power should not be going from the battery through the switch to the fan. Wire the second relay the same as the diagram, but with out the thermostat. The #86 on the relay will just go to ground. Provided you have wired your switch correctly, when you flip your switch from the low speed position to the high speed position the low speed will be de-activated and in the off position both are off.

Yes it is a 2 speed Taurus fan and I want to have a thermostat to turn the low on and a manual toggle switch for the high speed
and also have the toggle to turn it off completely.
Do I dare ask about having a light come on when the fan is on (both low and high)

[sharpxmen]

Sharpxmen for some reason your quote does not show all of my reply. And for some reason, I'm not sure why, I thought we were discussing a 2 speed Taurus fan not a single speed, my bad.

I understood your reply, didn't understand what he (haulincats) meant - your guess was better than mine, he was referring to the 2 speed Taurus.

[sharpxmen]

Yes it is a 2 speed Taurus fan and I want to have a thermostat to turn the low on and a manual toggle switch for the high speed
and also have the toggle to turn it off completely.
Do I dare ask about having a light come on when the fan is on (both low and high)

I assume you want something like this. I considered that the "low speed" lead and "high speed" lead are both supposed to be connected to "+12v" and not at the same time (someone who has a taurus 2 speed please confirm, i don't have one - also please confirm whether the 2 can or cannot be connected at the same time, to be on the safe side i considered that they cannot which makes more sense to me if the change in speed is not an "in series" resistive load)



also make sure the Main Fuse and the relays are rated for the current draw of the fan motor (I think Jeffy posted the amps for it in this thread, i was too lazy to look).

toggle switches: the first one on the low speed can be on(auto)/off, the second one would be high speed override (will be on high speed regardless whether the first switch is off or on and the thermostat can be also on or off - always high speed, it will automatically disconnect the low speed circuit when the relay switches to high speed)

those splice points labeled with A means you will have to feed the solenoid of the second relay with the same 12v switched source as the first relay (low speed) but from behind the fuse, you don't need a second fuse, same for the fan high current circuit, you only need 1 fuse (but that matches the amp requirement for the fan). the Relays need to be matched as well, the high speed one has to be at least the amps that the motor is rated at for high speed, the low speed relay has to match the amps that the motor is rated at for low speed (but it can be the same as for high speed if you want to keep it simple).

there is another solution for this - you can use an on-off-on switch and have the 2 relays in parallel rather than in series, the first "on" position would be in series with the thermostat, the off will keep both speeds off and the other "on" will activate the high speed relay - if i find time i'll post a diagram on that too

[sharpxmen]

or like this (this is using a 3 position switch on-off-on) - i made the same assumptions here as for the other diagram (the high speed and low speed leads are both 12v and cannot be connected at the same time) - please verify this first



you can also have the switch (EDIT: the on-off-on switch) connected on the +12v side as an alternative right after the 1A fuse and have the 2 connections going to pins 86 on the relays and connect the ends on the other side to ground - same with the thermostat, can be on the other side of the solenoid connected to pin 85.

let me know if you have any questions

[sharpxmen]

here's version#3 with the 3 position switch on the +12v 1A side

[st.chevrolet]

Yes it is a 2 speed Taurus fan and I want to have a thermostat to turn the low on and a manual toggle switch for the high speed
and also have the toggle to turn it off completely.
Do I dare ask about having a light come on when the fan is on (both low and high)

I have the 2 speed Taurus fan in my YJ with a on-off-on rocker switch. I have the switched 12v+ (comes on with ignition) supplying the power to the on-off-on switch. The low speed position of the switch activates a relay which allows current to flow from the battery to my DCC controller which is connected to the low speed wire of the fan. The high speed position of the switch activates a heavier amperage relay which again, allows current to flow from the battery but to the high speed wire of the fan. When I switch from low to high the DCC controller is de-activated and the opposite happens when going from high to low. In the off position obviously the fan is off.

[sharpxmen]

I have the 2 speed Taurus fan in my YJ with a on-off-on rocker switch. I have the switched 12v+ (comes on with ignition) supplying the power to the on-off-on switch. The low speed position of the switch activates a relay which allows current to flow from the battery to my DCC controller which is connected to the low speed wire of the fan. The high speed position of the switch activates a heavier amperage relay which again, allows current to flow from the battery but to the high speed wire of the fan. When I switch from low to high the DCC controller is de-activated and the opposite happens when going from high to low. In the off position obviously the fan is off.

Sean's install (let me know if i got it right):

[st.chevrolet]

Sharpxmen if your drawing is showing the dcc controller ground and the high speed relay ground together you are correct.
Haulincats for real nice good quality switches (labeled) with the light you are looking for go here: www.otrattw.com
jfrabat can vouch for the quality of the switches.

[sharpxmen]

Sharpxmen if your drawing is showing the dcc controller ground and the high speed relay ground together you are correct.

yep, affirmative.

[haulincats]

Man you guys are great !!!!!!!!!!!!! to be able to help out a dummy like me, Thanks.
Just one more ? ( I think just one more )
I already bought the relays and they are 5 pin, the 5th pin is 87 A
Can I still use them?
Thanks,
Vance

[FourbangerYJ]

It would be nice if these wiring diagrams could end up in the FAQ's 

Great job guy's!

[sharpxmen]

Man you guys are great !!!!!!!!!!!!! to be able to help out a dummy like me, Thanks.
Just one more ? ( I think just one more )
I already bought the relays and they are 5 pin, the 5th pin is 87 A
Can I still use them?
Thanks,
Vance

yes, you can use them
87a is the one that is not connected and in the first dual relay diagram i posted was only connected on the high speed relay. It is normally closed (the contacts are connected between terminals 87a and 30) so basically when you activate the relay it would disconnect 87a and 87 would be connected to pin 30.

EDIT: one thing that i did not answer or put in the diagrams was the monitoring lights - you can connect a light bulb between pin 87 on each relay and ground (one wire from the light bulb goes to pin 87 and the other one is connected to ground) - that way whenever a relay is activated (on) it will light up the corresponding bulb.

[haulincats]

yes, you can use them
87a is the one that is not connected and in the first dual relay diagram i posted was only connected on the high speed relay. It is normally closed (the contacts are connected between terminals 87a and 30) so basically when you activate the relay it would disconnect 87a and 87 would be connected to pin 30.

EDIT: one thing that i did not answer or put in the diagrams was the monitoring lights - you can connect a light bulb between pin 87 on each relay and ground (one wire from the light bulb goes to pin 87 and the other one is connected to ground) - that way whenever a relay is activated (on) it will light up the corresponding bulb.

Can I use just 1 light?