electric fan wiring - Team Camaro Tech
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post #1 of 6 (permalink) Old Sep 7th, 14, 12:08 PM Thread Starter
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Joe
 
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electric fan wiring

Currently running my dual electric fans (via relays) to a constant 12 volt source (battery). Want to rewire them to a switched 12 v source. What's the best = under dash fuse block, horn relay, etc.?
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post #2 of 6 (permalink) Old Sep 7th, 14, 01:04 PM
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Steiner
 
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Re: electric fan wiring

Can you better describe how they are wired?
The relays should perform the function of being the "switcher"....
Main power to relays should come from battery.
Coil supply/trigger to relays should come from temperature switch which is wired to a switched source, then the fans can only run if the key is on.
Typically it would be the relay coil positive wired to switched power, then the relay negative connected to the coolant temp switch (and toggle switch wired to ground if desired).

Yours don't run with the car off do they?

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #3 of 6 (permalink) Old Sep 7th, 14, 05:02 PM
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Re: electric fan wiring

I had mine on the horn relay so they'd come on with the motor running. I also carried a jumper wire after having a relay go bad.
Now with the LS motor I only need one fan running....and the other is switched so I can cool down faster between passes if needed

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #4 of 6 (permalink) Old Sep 7th, 14, 09:59 PM
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Doug
 
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Re: electric fan wiring

Look at this wiring diagram for my Be Cool system to see if it will help you any. http://static.summitracing.com/globa...ss_install.pdf
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post #5 of 6 (permalink) Old Sep 8th, 14, 07:47 PM Thread Starter
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Joe
 
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Re: electric fan wiring

Steiner. Mine are wired the way you describe except for the switched source scenario. I have a temperature sensor installed in the radiator that turns the fans on at 195 & off at 180. What I want to change is my SPAL relay wiring so the fans don't run with the engine off (until temp drops to 180 at which time fans do shut off). I'm not presently using a switched 12v source (so fans will never run with the engine off). Instead I'm currently wired (orange SPAL relay wire) to a constant 12v source. That's what I want to redo.
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post #6 of 6 (permalink) Old Sep 9th, 14, 03:56 AM
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Steiner
 
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Re: electric fan wiring

Joe, there's not many sources for switched 12V under the hood unfortunately. Just coil (which you don't want to use) and wiper motor (yellow wire) I think. The wiper feed can probably run it. Additionally there is an ACC and RUN spade on the fuse block inside the car. Either one of those can run it, just need a female spade and some wire. You can also put a small 3-5A fuseholder on it at the fuse bock although the circuit is fused.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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