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10-15-2010, 03:58 PM
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#1 |
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"the other guy"
Join Date: Oct 2008
Location: Olivehurst California 95961
Posts: 901
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dual electric fans....2 relays or 1?
got my dual 16" fans mounted and im ready to start wiring them up. i will be using a temp switch in the drivers side head to provide a ground. do i need 2 relays?
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God Said,"Building A 10 Second Import Is Like Coming Out Of The Closet, In The End Ur Still....."EXPLETIVE" 
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10-15-2010, 04:21 PM
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#2 |
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6>8 Plugless........
 
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,143
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Re: dual electric fans....2 relays or 1?
I would use a relay per fan. It sucks big time when your wiring or relay melts down on a trip. Been there done that.
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Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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10-15-2010, 04:25 PM
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#3 |
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"the other guy"
Join Date: Oct 2008
Location: Olivehurst California 95961
Posts: 901
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Re: dual electric fans....2 relays or 1?
does that mean use 2 temp switches too or would 1 provide sufficient ground for 2 relays? thanks
__________________
God Said,"Building A 10 Second Import Is Like Coming Out Of The Closet, In The End Ur Still....."EXPLETIVE"
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10-15-2010, 04:40 PM
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#4 |
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6>8 Plugless........
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,143
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Re: dual electric fans....2 relays or 1?
I used one temp switch on one, and then I hooked the other in line with the a/c clutch so it would come on when the a/c is on. I also hooked the 2nd fan in to a wire that I can toggle in the cab that allows the 2 fans to work as one through the 2 relays that way if I was towing and the a/c wasn't on I could still have 2 fans.
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Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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10-15-2010, 06:34 PM
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#5 | |
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sharp as a marble
 Join Date: Jan 2007
Location: atlantic beach,florida
Posts: 1,082
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Re: dual electric fans....2 relays or 1?
Yes, like Dieselw said. I just installed a dual 11" fan setup in a customers car, and used all SPAL fan stuff. Dual fans, and their PWM fan controller. Worked great. The controller works like one relay, and their instructions said to use an additional relay to power the other fan. The controller is programmable for you to set turn on and turn off temps, using one temp switch. If you go to their site and click on the PWM, there will be a download with instructions to install. They also recommend a toggle switch for an override, just in case of a failure. I spoke to them when I had a couple of questions, and they were very helpful in helping me understand their product. I would use this setup again.
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10-15-2010, 06:37 PM
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#6 |
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Msgt USAF Ret
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,723
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Re: dual electric fans....2 relays or 1?
Here's a diagram. It only has one fan but the second one would be easy to add and I would run a second relay also. That way you would have a back-up in case one failed. Where are you mounting the temperature gauge sender?
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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10-15-2010, 06:52 PM
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#7 |
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"the other guy"
Join Date: Oct 2008
Location: Olivehurst California 95961
Posts: 901
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Re: dual electric fans....2 relays or 1?
either drivers head or drivers side intake passage
__________________
God Said,"Building A 10 Second Import Is Like Coming Out Of The Closet, In The End Ur Still....."EXPLETIVE"
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10-18-2010, 09:34 PM
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#8 |
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Registered User
Join Date: Feb 2008
Location: Jackson, TN
Posts: 99
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Re: dual electric fans....2 relays or 1?
...and keep a spare relay or 2 in the glove box. Cheap insurance when a relay goes bad.
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Retired Navy 1972 C10 Cheyenne fleetside 350 sbc, 700r4, 3.42 rear |
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