How to wire a dual electric fan relay/switch
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Car: 1984 Pontiac Firebird S/E
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How to wire a dual electric fan relay/switch
Hey everyone, I have a carbed 350 swapped 84 firebird with the original radiator/ dual electric fan setup. Both the fans turn on with the ignition being in the "On" position and are on ALL of the time. Basically it uses a lot of my power when trying to start my car dragging the starter making it crank slowly at first. I was wondering if anyone could tell me how to wire two separate switches for each fan with a relay, or even one switch that controls both fans(if thats easier)? So I don't have to have the fans on when I go to start the car. Plus I heard having the fans on all the time can burn the motors out and if you don't have a relay it has a phantom draining effect on your battery... If anyone has done this before I would really appreciate the help. Thank you!
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Car: 85 Silver Iroc, 79 Camaro
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Re: How to wire a dual electric fan relay/switch
Look here.....
https://www.thirdgen.org/forums/cool...iring-kit.html
Been covered numerous times. You can look it up bu using the search function at top of page.
Good luck
https://www.thirdgen.org/forums/cool...iring-kit.html
Been covered numerous times. You can look it up bu using the search function at top of page.
Good luck
#3
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Car: 1984 Pontiac Firebird S/E
Engine: LG4 305
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Axle/Gears: 3.73
Re: How to wire a dual electric fan relay/switch
Thats not quite what I was looking for, thank you though... I want two manual switches. I don't want temp switching or anything like that. Just a simple circuit that will control the function of my fans and not kill my battery.
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Car: 85 Silver Iroc, 79 Camaro
Engine: LB9, 500+ ci BBC
Transmission: 700R4, th400 with brake
Axle/Gears: 3.42, hand made 40 spline 9"
Re: How to wire a dual electric fan relay/switch
Your factory fan switch works off ground. It grounds the switch, which closes the relay, turning the fan on. All you have to do is cut the dark green/white wire at the relay and run a wire into the car to the switch. Then ground the other side. If you're worried about the fan staying on all the time, you could wire in a relay to prevent that.
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Car: 1984 Pontiac Firebird S/E
Engine: LG4 305
Transmission: Borg-Warner T5
Axle/Gears: 3.73
Re: How to wire a dual electric fan relay/switch
Maybe you can make sense of this...The black wire on the right connects to the positive side of my ignition coil. The big blue wire connects to my fans and has a ground point towards the front of the vehicle close to the fans. The bright red wire is switched 12V ignition power that I power my gauges with(Also turns on my fans). The dirty red wire connected to my bright red wire goes through the firewall right behind my engine block. I'm sorry I didn't explain it better, I only have the stock radiator and fans. The wiring is much different from stock and looks really stupid and convoluted. From this point how could I do what I want with the wiring to have a switch/relay for the fans. Should I re-wire the whole system?
#6
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Car: 85 Silver Iroc, 79 Camaro
Engine: LB9, 500+ ci BBC
Transmission: 700R4, th400 with brake
Axle/Gears: 3.42, hand made 40 spline 9"
Re: How to wire a dual electric fan relay/switch
I can't view your picture. There has to be a relay somewhere that is wired to the fans.
#7
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Car: 85 Silver Iroc, 79 Camaro
Engine: LB9, 500+ ci BBC
Transmission: 700R4, th400 with brake
Axle/Gears: 3.42, hand made 40 spline 9"
Re: How to wire a dual electric fan relay/switch
Usually it's right next to battery on your car, tucked next to radiator....IIRC.
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#8
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Car: 1984 Pontiac Firebird S/E
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Axle/Gears: 3.73
Re: How to wire a dual electric fan relay/switch
Damn, well let me see if I can get a viewable picture on here. I don't see any relay anywhere. My fans are pretty much directly connected to 12v switched power.
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Car: 1984 Pontiac Firebird S/E
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#10
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Re: How to wire a dual electric fan relay/switch
Those are the photos I was talking about, whats up with that?
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Car: '82 z28
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Re: How to wire a dual electric fan relay/switch
those fans are not original to the car-they are '87-92 era,car probably had a clutch fan originally so there will be no factory fan wiring-best would be to use separate fuses and relays for each fan so if something happens to one the other will still be operable(easy to have separate switch for each too) each fan motor will draw around 7 1/2 amp once up to speed,startup current will be higher,possibly around 20 amp-could try a 20 fuse and see if it holds-uprate if it does.
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Re: How to wire a dual electric fan relay/switch
Here's an option that you might consider:
https://www.thirdgen.org/forums/cool...electrics.html
JamesC
https://www.thirdgen.org/forums/cool...electrics.html
JamesC
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Car: LOWERED ♦ CRIMSON METALFLAKE
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Keepin Up With The Jonesyfxrs
Originally Posted by Jonesyfxr
If you're worried about the fan staying on all the time, you could wire in a relay to prevent that.
No need for a relay to do that.
When the ignition is turned off power is removed from the + side of the Relay Coil.
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