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Unread 02-23-2010, 10:03 PM   #1
czjeeper
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E-fan wirng question

I've been running a Taurus electric fan for about a year now.
I love it.
I just have it wired right now to come on with the key.
I only have the low side wired, and it does a more than adequate job of cooling.
I would like to modify my wiring to include a temp sensor (which I have from Autozone), and to automatically come on with the A/C.
I don't need or want a switch in the cab.
I don't care about the high side fan. I've never needed it.
Not sure if it should also come on when my York OBA is on. I don't think it needs to.
Can anybody help me out with a simple wiring diagram to make this all work?
I've looked and can't seem to find a diagram that does what I've described.
Thanks!

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Unread 02-23-2010, 11:31 PM   #2
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I thought I would add that I'm using the Tyco 75 amp relay.
I screwed around for a little while in the garage but can't figure it out.
Hope somebody can help.
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Unread 02-23-2010, 11:50 PM   #3
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what controller/sensor do you have?

most 12v relays have the same plug pattern

pin 30 is power from the battery
pin 87 is the fan power or other load
pin 85 is ground
pin 86 is power from the switch to control the relay


you just need power from the battery to the relay, then use the sensor to turn the relay on and off.
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Unread 02-24-2010, 12:02 AM   #4
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You can use this diagram and just take out the switch and the high side relay. And the LED relay too if you want. Just run 12v hot into #30 on the low side relay, and 12v from the ignition switch to #85.

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Unread 02-24-2010, 12:11 AM   #5
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Quote:
Originally Posted by jbolty View Post
what controller/sensor do you have?

most 12v relays have the same plug pattern

pin 30 is power from the battery
pin 87 is the fan power or other load
pin 85 is ground
pin 86 is power from the switch to control the relay


you just need power from the battery to the relay, then use the sensor to turn the relay on and off.
I'm using the adjustable temp controller from Autozone.

Also, how do I turn the fan on when I turn on my a/c?
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Unread 02-24-2010, 07:26 AM   #6
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Quote:
Originally Posted by czjeeper View Post
I'm using the adjustable temp controller from Autozone.

Also, how do I turn the fan on when I turn on my a/c?
IIRC the control circuit for the existing system energizes the high idle solenoid with an orange wire. Find that and use it to control the relay.
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Unread 02-24-2010, 08:51 AM   #7
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Quote:
Originally Posted by jbolty View Post
IIRC the control circuit for the existing system energizes the high idle solenoid with an orange wire. Find that and use it to control the relay.
So, can I use the thermostat and the A/C wire both plugged in to 85?
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Unread 02-24-2010, 09:29 AM   #8
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That should work. One or the other or both will energize the relay.



Actually, thinking about it as I'm typing that might not work because the high idle would then come on whenever the temp sensor side has power, unless you put a diode in the circuit.



I would probalby wire a seperate circuit and use the A/C to kick on the high speed side.
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Unread 02-24-2010, 09:37 AM   #9
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So, I found a few diagrams after searching all night on the web.
On the second diagram, can I just delete the switch?



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Unread 02-24-2010, 10:01 AM   #10
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That would work but personally I would keep the switch. It's nice to be able to turn off the fan for either working on something or driving thru water.
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