Taurus Fan Wiring
Elder User
Joined: May 2007
Posts: 754
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From: Solon, Ohio
The center terminal of the switch would go to the battery connection.
One side of the switch would go to the +12 switched connection.
The other side of the switch would go through a diode to 85 on the high speed relay, just like the A/C is connected.
One side of the switch would go to the +12 switched connection.
The other side of the switch would go through a diode to 85 on the high speed relay, just like the A/C is connected.
Elder User
Joined: May 2007
Posts: 754
Likes: 1
From: Solon, Ohio
BTW, because you are using a switch and desiring it to stay on by itself when the thermostat calls for it, do not hook the +12 switched source to a 12 switched source, LOL.
The switch you are installing is the switched source.
The switch you are installing is the switched source.
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Postmaster
Joined: Oct 2006
Posts: 4,816
Likes: 1
From: Davis & Newcastle, CA
I'm not sure I understand... You're saying NOT to connect that to a switched source (such as my ignition) but rather to a +12v constant because the 3-way switch I'm using IS the switch? But that would mean I would have to flick it to off whenever I get out of the truck correct? Because that is not what I want. I would like it to shut off when the truck shuts off, with the option of flipping the switch to the lower position to manually run the fan on high...
Last edited by Skandocious; Aug 2, 2007 at 11:17 PM.
Elder User
Joined: May 2007
Posts: 754
Likes: 1
From: Solon, Ohio
Just like you have it wired now.
For it to stay on after everything is turned off the center of the switch has to go to an unswitched source.
It's late..........i'm tired LOL
You can by using a DPDT center off switch make it so that it stays on only for the thermostatically controlled position of the switch.
I'll post how in the morning.
For it to stay on after everything is turned off the center of the switch has to go to an unswitched source.
It's late..........i'm tired LOL
You can by using a DPDT center off switch make it so that it stays on only for the thermostatically controlled position of the switch.
I'll post how in the morning.
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Postmaster
Joined: Oct 2006
Posts: 4,816
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From: Davis & Newcastle, CA
Awesome man. Hey I really appreciate it, didn't mean to put you out. I won't be doing this for a couple days anyways so no rush.
Anyone else that wants to comment on the way I currently have it wired please do, I have no clue if and how any of this circuit works, although I do know how to wire it luckily
Anyone else that wants to comment on the way I currently have it wired please do, I have no clue if and how any of this circuit works, although I do know how to wire it luckily
Posting Guru
Joined: Nov 2005
Posts: 2,442
Likes: 1
From: La Grande, OR
ok, if you want the fan to run with the engine off, but want to have to worry about flipping off the switch instead of hooking the power source of the switch to the battery, connect it to a 12v switched source. That will make it work when the key is on, but the engine doesn't have to be running.
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Elder User
Joined: May 2007
Posts: 754
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From: Solon, Ohio
For LED indicators, tie one side of the LED to ground and the other through a 1K resistor to terminal 85 of the relay you want to indicate as being on.
The 1K (1000 ohms) value is ballpark and will depend on the led's you use and the brightness desired.
The 1K (1000 ohms) value is ballpark and will depend on the led's you use and the brightness desired.
Elder User
Joined: May 2007
Posts: 754
Likes: 1
From: Solon, Ohio
BTW, you mentioned in your first post needing 80-90 amps.
I think 10 amp relays will be quite sufficient.
Make sure you get DC relays, not AC, but they can be AC/DC.
They might have them at Radio Shack.
I think 10 amp relays will be quite sufficient.
Make sure you get DC relays, not AC, but they can be AC/DC.
They might have them at Radio Shack.
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Postmaster
Joined: Oct 2006
Posts: 4,816
Likes: 1
From: Davis & Newcastle, CA
What makes you think 10 amp relays will suffice? I have read that the high speed spikes to 80-90amps when it first turns on and then levels out at around 40-50amps. How could a 10amp relay handle that?
Elder User
Joined: May 2007
Posts: 754
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From: Solon, Ohio
The fan relays I have seen in cars are nowhere 50 amps.
As far as the turn on spikes, they kinda don't count because the relays are rated for their sustained current carrying capacity and of course have a much higher spike rating.
I may be wrong, but I doubt that the fan draws 50 amps continous.
You could test it by hooking it up to a battery first without a relay, and see how small of a fuse it will run on continously. I would start with 20 fuse then go lower.
50 Amps is a pretty big relay.
As far as the turn on spikes, they kinda don't count because the relays are rated for their sustained current carrying capacity and of course have a much higher spike rating.
I may be wrong, but I doubt that the fan draws 50 amps continous.
You could test it by hooking it up to a battery first without a relay, and see how small of a fuse it will run on continously. I would start with 20 fuse then go lower.
50 Amps is a pretty big relay.
Senior User
Joined: Jun 2007
Posts: 159
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From: Hallandale Beach
SK, I hope your going to take pictures on which wires you hook into and the rest once your done. Those schematics are confusing. Of course your opinion on the electric vs the standard fan setup would be nice as well. There are conflicting opinions around these parts concerning the swap out.
B
B
Senior User
Joined: Sep 2006
Posts: 163
Likes: 3
Originally Posted by netscaner
The fan relays I have seen in cars are nowhere 50 amps.
As far as the turn on spikes, they kinda don't count because the relays are rated for their sustained current carrying capacity and of course have a much higher spike rating.
I may be wrong, but I doubt that the fan draws 50 amps continous.
You could test it by hooking it up to a battery first without a relay, and see how small of a fuse it will run on continously. I would start with 20 fuse then go lower.
50 Amps is a pretty big relay.
As far as the turn on spikes, they kinda don't count because the relays are rated for their sustained current carrying capacity and of course have a much higher spike rating.
I may be wrong, but I doubt that the fan draws 50 amps continous.
You could test it by hooking it up to a battery first without a relay, and see how small of a fuse it will run on continously. I would start with 20 fuse then go lower.
50 Amps is a pretty big relay.