Electric fans wiring help

jay28

jay28

Well-Known Forum User
Hi all,

Ok ide like to point out that I am hopeless at wiring.

First off this is what I purchased
JEGS Performance Products 10569 JEGS Electric Fan Wiring Harness Kits Heres the instructions for the above
http://www.jegs.com/InstallationInstructions/500/555/555-10569.pdf

I also bought the temperature contril unit
JEGS Performance Products 52125 JEGS Adjustable Temperature Control Switch
And again the instructionshttp://www.jegs.com/InstallationInstructions/500/555/555-52125.pdf

I tries to wire everything up but the fans dont seem to work. I think my problem is with the yellow wires in the duel fan kit, It says to wire them to the ignition or an "aux fan switch" So I wired the 2 yellow wires to to the number "2" on the temp control switch........does that sound right?

"c" on the switch goes to the positive on the fan?

I wired it up then put the sensor in boiling water with the ignition on, to see if the fans would kick in, but no joy. I want to make sure they work before I start the engine.

I HATE WIRING!!! :smash::smash:
 
The two yellow wires should go to the C terminal on the switch, the purple positive wires from the fan go to the relay, the '2' terminal on the switch goes to a switchable live at the ignition, or straight to +12v if you are bypassing the ignition switch.

I think :)
 
Hang on a minute...

Are you using the relays? Because it looks like that temp control unit has some sort of internal switching circuit so the relays are probably redundant, it would be like using a relay to switch another relay. So I would just use the adjustable temperature control and not the relay kit, unless there's some other reason you need it.
 
Thanks for the reply...................yeah im using the relays along with the temperature control unit.

So you dont think I need the relays at all?
 
Oh actually sorry, I was looking at it from a simplicity (or maybe that should be simpleton, haha) point of view, but of course you need the relays for the direct feed from +12v otherwise you might fry the old wiring.

I was having a duurrrr moment
 
Ah ok so do I go along with your first post then?

Nothing about wiring is simple, well for me anyway!
 
I don't know, maybe if you are feeling brave or lucky :p

I mean, that's the way I think it should be connected, but it ain't my car so I'm not gonna say try it and find out!

I've attached a sh** picture of how I think it works. In my mind it makes sense, but then so does so much other crazy stuff.
 

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Ha thanks, well I'll give it a try tomorrow, thanks for the reply, your the only one that's been any help!

I'll let you know how I get on
 
Just a few points and confirmations to add.

The diagram posted is basically the way I would wire it. If you break it down it'e pretty easy to understand. The relay is just a switch in the live wire between the battery and the fan your controlling. So, your live comes from the battery, through a fuse, through the relay switch connections,to the fan live connection, then to earth. Then to control the relay you go from the ignition switch (ignition on terminal), to the relay + coil terminal, from relay - terminal to the temp switch, then to earth. This will produce a discreate factory looking installation.

If you would like the fan to opperate when the ignition is off then take your live feads dirrect from the battery.

If you use the temp control unit you bought then from the instructions it appears you don't nead any of the relay setup as the control unit will switch the full load of the fan. You could use the relay circuit described above to control this unit if you want. Just connect the wire that goes to the fan to the live fead to the control unit.

Personally I would have just bought a 12v 20/25A relay, temp. switch from another car, and just wired it in.
 
Just re-read your original post and assuming you have wired the relay side correct, you could just use the temp. control unit to control the fan relays. To do this connect the yellow wires from the relays to the C connection. The 2 connection just goes to the battery or ignition switch live.

You nead to seperate the power and control circuits in your head and deal with them seperately.

Hope this helps but I fear I may have just confused the issue. Sorry if I have.
 
Thanks for the help...........between your post and morbias im sure ill get it sorted.

Im going to try connect the yellow wires to the C connection on the temp control fan and the 2 connection to the battery, If that doesnt work ill disconnect the relays and just try using the temp control unit on its own.

Ill let you know how I get on.

Cheers
 
Twenty five years ago I had my wrists publicly slapped for suggesting that electric fans could be wired without using a relay and the lesson has stuck (score +1 for corporal punishment as a teaching aid...).

The thermostat is a low current switching circuit to actuate the relay. The relay then directs the the higher current at switch on and continued high current for fan operation. All the switch side wiring can be low rated, but the fan wiring, including the earth route should be matched to a grade of cable in excess of the switching current. Don't use a common earth with the switching side of the relay unless this is suitably rated. Make sure the relays are rated in excess of the maximum switching current. Both switching and main feed should have appropriate fuses.

If wiring twin fans, don't be tempted to bridge power from one relay to another - I speak from personal experience: when the second fan kicks in, you have a potential fire hazard. Separate feeds and separate fuses...
 
Just to let you all know that I got the fans working, yellow wires to C done the trick.

Now on to engine problems:beatdeadhorse::beatdeadhorse::
 
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