Wiring Dual Fans to toggle switch?
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Car: 85 Iroc-Z
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Wiring Dual Fans to toggle switch?
I want to wire up my dual fans so that I can turn them both on at the same time by using a toggle switch. Can somebody please explain exactly how to do this step by step? I have a 30 amp LED toggle switch that I will be using. I searched but couldnt find what I was looking for. The switch has three connections on it (Power, Lead, Ground) and I need to know what wires go where. Also, do you have to use a relay in this set up or not?
Last edited by 85Iroc-Z; 11-10-2008 at 10:41 AM.
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Car: 85 Iroc-Z
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Re: Wiring Dual Fans to toggle switch?
pitpens13@aol.com
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I forgot to mention that my engine harness isnt set up for dual fans so I wont be able to splice into it.
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I forgot to mention that my engine harness isnt set up for dual fans so I wont be able to splice into it.
Last edited by 85Iroc-Z; 11-10-2008 at 07:53 PM. Reason: Automerged Doublepost
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Re: Wiring Dual Fans to toggle switch?
I can just use the relay from a dual fan wiring harness without any problems right?
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Re: Wiring Dual Fans to toggle switch?
Here is how I wired mine using a SPST relay: Hot from battery to relay. Hot from under dash (acc at fuse block) to toggle. Toggle to relay. Relay to ground. 30/87 should be your contacts and 85/86 should be your coil.
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Re: Wiring Dual Fans to toggle switch?
Can anybody show me pictures of how they wired their dual fans to one toggle switch, and how the wiring to the relay went?
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Re: Wiring Dual Fans to toggle switch?
Heres my quick 10 minute MS Paint wiring diagram. I would recommend using ignition power for the relay coils, so you can't accidentally leave your fans on and run the battery dead. Note that the switch controls relay coil ground, not power - this is safer (and easier) since you only have to run a single ground wire into the cabin to the switch. Also note that I'm showing 2 fuses, one for each fan. That way, if one fan shorts/fails, the other should still run and get you home.
Last edited by Ward; 11-18-2008 at 01:22 PM.
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Re: Wiring Dual Fans to toggle switch?
I realize that many members use a toggle switch--and no doubt are satisfied with that approach. I didn't wish to be troubled with remembering to turn on/turn off (I know myself well enough to know I'd eventually forget), but I did want both fans to work together, so here's what I did:
https://www.thirdgen.org/forums/cool...electrics.html
JamesC
https://www.thirdgen.org/forums/cool...electrics.html
JamesC
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Re: Wiring Dual Fans to toggle switch?
What are the benefits of having relays in the wiring? Could anything happen if they aren't put in?
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Re: Wiring Dual Fans to toggle switch?
Could I use the factory dual fan relay? If not, what should they be, 30 amp relays?
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Re: Wiring Dual Fans to toggle switch?
i have one main question:
why do u want dual fans on one toggle switch.
reason for my question:
i have an 87 5.7 iroc with 113k miles and even in the summer i hardly had to use both fans. If i stopped at a redlight or parked for a min then id have to turn on one of the fans.... if i sat too long then i would def have to turn on both of the fans but thats only if the water gauge would get to like 250 which i cringe whenever i see it stray from 150-180.... not that i really know what these should run at lol
why do u want dual fans on one toggle switch.
reason for my question:
i have an 87 5.7 iroc with 113k miles and even in the summer i hardly had to use both fans. If i stopped at a redlight or parked for a min then id have to turn on one of the fans.... if i sat too long then i would def have to turn on both of the fans but thats only if the water gauge would get to like 250 which i cringe whenever i see it stray from 150-180.... not that i really know what these should run at lol
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Re: Wiring Dual Fans to toggle switch?
I used 2 of these:
http://www.radioshack.com/product/in...ductId=2062477
I probably should have also noted in the diagram that the fan power wires need to be fairly heavy, 12 or 10 gauge wire should work fine. The relay coil wires can be smaller, 16 gauge or so.
Also, I would mount the relays fairly close to the fans themselves, like on the inner fender, or core support. The idea is to make the high current draw wires as short as possible, again to minimize risk of fire.
Last edited by Ward; 11-18-2008 at 10:43 PM.
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Re: Wiring Dual Fans to toggle switch?
So I need 2 relays with 4 prongs on them each (2 ground, 2 power)? I just decided to put both of them to one switch so that it would cool down real quick when it got hot, and they wouldnt have to stay running as long. What would be better about wiring them to two seperate switches?
#17
Re: Wiring Dual Fans to toggle switch?
[QUOTE=85Iroc-Z;3948705]Can anybody show me pictures of how they wired their dual fans to one toggle switch, and how the wiring to the relay went?
On my 1992 blazer 350tbi I am trying to run dual fans to a switch also in not sure if I need two relays and two switches or if one relay and one switch would work I just want it to be done right so can you guys out there give me any clues of how i need to wire it or the best way to go about converting it plez thanks
On my 1992 blazer 350tbi I am trying to run dual fans to a switch also in not sure if I need two relays and two switches or if one relay and one switch would work I just want it to be done right so can you guys out there give me any clues of how i need to wire it or the best way to go about converting it plez thanks
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