electric fans question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GRAYGHOST · 08-04-2006, 12:26 AM

I want to put electric fans on my truck. My question is, how do you wire the fans using a thermo switch? Thanks for the help.

jamon8 · 08-04-2006, 09:11 AM

make sure that u use a relay!!!!

when you buy an adjustable thermo switch it will come with directions

again- make sure you use a relay

67chevemall · 08-04-2006, 09:31 AM

I'd just use a toggle switch. keep it simple and you always know if it is working or not.

And don't forget that relay.

67gmcss · 08-04-2006, 08:09 PM

A severe novice here, but I was wondering Why the relay was so important?

Sweet72 · 08-04-2006, 09:21 PM

The fans draw alot of current and a relay is capable of handling this current, the thermal switch is not. Use the thermal switch to control the windings of the relay and the relay contacts to switch the fan/fans on and off. A toggle switch to override the thermal switch would be a good idea. Monitor your water temp closely with the elec fans. I've heard horror stories of guys burning up their expensive engines when/if the fans stop working due to a bad thermal switch, relay etc...

Sweet72 · 08-05-2006, 05:03 PM

I found this, hope it helps you understand how the circuit should be wired. http://www.aaroncake.net/rx-7/efaninstall.htm

gangforward · 08-05-2006, 05:28 PM

I got the kit from Wes for my truck (383 stroker, headers, etc) it is well thought out, complete, and works awesome!

Strong endorsement - Wes's kit is da' bomb!

76bonanza · 08-05-2006, 11:03 PM

2nd on the kit from wes. No relay either switch is controled with grounds, power wired right to battery

chevy50 · 08-05-2006, 11:52 PM

I found if you wire the fan to a toggle switch instead of a relay,if you go to shut your motor down,it will keep runnin until the fan quits turnin.Strange,eh?

aitch · 08-06-2006, 07:52 AM

Quote:

Originally Posted by Sweet72

I found this, hope it helps you understand how the circuit should be wired. http://www.aaroncake.net/rx-7/efaninstall.htm

Thanks for posting that link. It should be a must read for anyone considering installing an electric fan set-up.
It pretty much debunks the horsepower gains advertised by Black Max and others.

08-04-2006, 12:26 AM	#1
GRAYGHOST Registered User Join Date: Aug 2005 Location: Spring, Tx. Posts: 31	electric fans question I want to put electric fans on my truck. My question is, how do you wire the fans using a thermo switch? Thanks for the help.

08-04-2006, 09:11 AM	#2
jamon8 Registered User Join Date: Apr 2006 Location: southern Il Posts: 335	Re: electric fans question make sure that u use a relay!!!! when you buy an adjustable thermo switch it will come with directions again- make sure you use a relay

08-04-2006, 09:31 AM	#3
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Re: electric fans question I'd just use a toggle switch. keep it simple and you always know if it is working or not. And don't forget that relay. __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

08-04-2006, 08:09 PM	#4
67gmcss Registered User Join Date: Jan 2002 Location: somerset,kentucky,usa Posts: 154	Re: electric fans question A severe novice here, but I was wondering Why the relay was so important?

08-04-2006, 09:21 PM	#5
Sweet72 Registered User Join Date: Nov 2003 Location: Alexandria, VA Posts: 1,534	Re: electric fans question The fans draw alot of current and a relay is capable of handling this current, the thermal switch is not. Use the thermal switch to control the windings of the relay and the relay contacts to switch the fan/fans on and off. A toggle switch to override the thermal switch would be a good idea. Monitor your water temp closely with the elec fans. I've heard horror stories of guys burning up their expensive engines when/if the fans stop working due to a bad thermal switch, relay etc... __________________ '72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.

08-05-2006, 05:03 PM	#6
Sweet72 Registered User Join Date: Nov 2003 Location: Alexandria, VA Posts: 1,534	Re: electric fans question I found this, hope it helps you understand how the circuit should be wired. http://www.aaroncake.net/rx-7/efaninstall.htm __________________ '72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.

08-05-2006, 05:28 PM	#7
gangforward Hootis is as Hootis does... Join Date: Nov 2002 Location: Southern Georgia Posts: 500	Re: electric fans question I got the kit from Wes for my truck (383 stroker, headers, etc) it is well thought out, complete, and works awesome! Strong endorsement - Wes's kit is da' bomb! __________________ 67 C10 LWB Fleet, 383, TH400, PS, 4BL-Holley, Headers & 3" Exhaust, 3" drop front, 4" rear springs, ECI shock relocate, Panhard Bar kit, wheels & tires 1995 Z28 Convertible - Borla, K&N, Lingenfelter Motor, C6 Wheels & Tires 1990 2500 4x4 Suburban 3" Catbac System, K&N, 2" Lift, Wheels, Tires

08-05-2006, 11:03 PM	#8
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Re: electric fans question 2nd on the kit from wes. No relay either switch is controled with grounds, power wired right to battery __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

08-05-2006, 11:52 PM	#9
chevy50 New Member Join Date: Apr 2006 Location: west virginia Posts: 29	Re: electric fans question I found if you wire the fan to a toggle switch instead of a relay,if you go to shut your motor down,it will keep runnin until the fan quits turnin.Strange,eh?



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.