Wiring my fans. I'm a n00b

[s1ngletracker]

dude, everything in that box is a relay. I just recently did something like this with my jeep, and that is an apropriate way to do it. Just make sure the relay is rated for the (combined) amperage draw of the fans. I don't think you wanna just have your fans wired to a switch. Too much potential for 'human error'. You could wire up a manual override/disable though. I did that with a SPDT switch. DPDT would be even better.

[4g63tcrazy]

Here ya go with a thermo switch

http://www.dsmstyle.com/photopost/data/500/dual_fan.png

So I would put the switch in the wire going from the positive battery terminal to the #35 on the relay then right? Now I need to figure out which wire is positive and which is negitive coming from the thermo switch.

[Pushit2.0]

The only thing in the diagram I see is I would have switch power from the relay going to the fans, not switched ground. They will work either way. The thermal switch does not have a positive/negative, when it gets above the set temp it completes the circuit between the terminals. And in this case it would complete the ground circuit on the trigger side of the relay to complete the ground circuit of the fans so they turn on. Also if you want one fan to be a pusher and the other fan to be a puller you will have to have the polarity switched going into the fans, so if your wires are blue and black coming out of the fans you will have a blue and black from each fan be positive and the other blue/black wires as ground. Also with the relay you would have 30 as your main fused power from the battery, then 87 out would go to the fans, and 87a is not used. Then have 85 as your switched power 12v, not straight from the battery, and have 86 go threw the thermal switch to complete your circuit to ground, you could use any good chassis ground to avoid extra wire length.

~John

[blackrosenova400]

You would add a switch to bridge the thermostatic switch. I added arrows pointing to the wires to use.

http://www.dsmstyle.com/photopost/data/500/dual_fan_with_switch.png

[4g63tcrazy]

The only thing in the diagram I see is I would have switch power from the relay going to the fans, not switched ground. They will work either way. The thermal switch does not have a positive/negative, when it gets above the set temp it completes the circuit between the terminals. And in this case it would complete the ground circuit on the trigger side of the relay to complete the ground circuit of the fans so they turn on. Also if you want one fan to be a pusher and the other fan to be a puller you will have to have the polarity switched going into the fans, so if your wires are blue and black coming out of the fans you will have a blue and black from each fan be positive and the other blue/black wires as ground. Also with the relay you would have 30 as your main fused power from the battery, then 87 out would go to the fans, and 87a is not used. Then have 85 as your switched power 12v, not straight from the battery, and have 86 go threw the thermal switch to complete your circuit to ground, you could use any good chassis ground to avoid extra wire length.

~John

Instead of switching the polarity I was just gonna take the fan blades off and flip it around. But either way would work..

You would add a switch to bridge the thermostatic switch. I added arrows pointing to the wires to use.

http://www.dsmstyle.com/photopost/data/500/dual_fan_with_switch.png

How exactly would I use a switch to bridge the thermo switch? I understand now that when it gets to a certain temp the thermo switch connects the circuit. So with the switch I would need to be able to flip it on and connect it. Do I need a 2 pronge switch? 3 pronge?

I feel like I'm not understanding the most simple concept and it's throwing me for a loop..

[4g63tcrazy]

Ok so I think I got it. This one is switched power instead of ground. Let me know if I'm missing anything.

http://i224.photobucket.com/albums/dd75/nashmkna/fanrelaywiring.jpg

[blackrosenova400]

Thats perfect

[4g63tcrazy]

So basically this is how the car is wired up stock and all I need to do is put a switch between the 2 wires coming off the thermoswitch? Or is it wired in a different way?

[goodhart]

Ugh, wiring makes my brain hurt...

[LingLing]

Ugh, wiring makes my brain hurt...

+1 I'm with you there. I hate wiring with a passion.