Fan Relay Wiring - Team Camaro Tech
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post #1 of 8 (permalink) Old Oct 18th, 07, 08:59 PM Thread Starter
 
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Fan Relay Wiring

Trying to wire in a relay with a temperature thermal switch for an electric fan. The switch is supposed to turn the fan on @185* & OFF @170*. It is supposed to ground by screwing into the intake &the thermal switch has one connector on top. Don't have the relay wiring anymore, so trying to make my own. As far as the relay wiring, would I connect 12v power from the battery to 30, temperature switch to 86, ground to 85, & fan motor to 87. If this is correct will the fan turn off when the ignition is off? It seems like I am missing a switch power source. Where should this connect on the relay?
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post #2 of 8 (permalink) Old Oct 18th, 07, 09:59 PM
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Royce
 
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Re: Fan Relay Wiring

Chris,
Here is a link to my photobucket page where I have a relay wiring diagram. You will use your thermal switch just like a regular switch (a switch is a switch).


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post #3 of 8 (permalink) Old Oct 18th, 07, 11:09 PM Thread Starter
 
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Re: Fan Relay Wiring

Only thing is the thermal switch doesn't have a anything to wire a switched source. Wouldn't that mean the fan would still be on if the ignition was turned off?
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post #4 of 8 (permalink) Old Oct 18th, 07, 11:38 PM
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Sean
 
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Re: Fan Relay Wiring

It would depend on if your power source was always hot or hot only with the key on. Like Royce said, a switch is a switch, so it will close the contacts (turn on the switch) at whatever temp you set it, it's just the trigger. Whether there was power available depends on the power source, if it was on constant hot it would run until it dipped below the set temp. Or if it was on with the ignition on, it would turn off at temp, or when the key was off.
Does that make sense?

Sean

1968 rs with an old school 354" SB2.2 pump gas motor.

Repetition does not transform a lie into a truth.

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post #5 of 8 (permalink) Old Oct 18th, 07, 11:44 PM Thread Starter
 
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Re: Fan Relay Wiring

I see. So I can use either 12v constant or switched at position 30 of th relay.
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post #6 of 8 (permalink) Old Oct 19th, 07, 12:12 AM
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Sean
 
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Re: Fan Relay Wiring

Well thats actually not what i meant, I don't think I was very clear though.
You can use switched or unswitched power at term. #86, # 30 you will want constant battery power, that supplies the fan direct from the battery, term # 86 is just the "switch" portion of the relay.
So, --#30 to # 87 is the path to the fan of the hot, and the ground will be sourced from the fan motor.
--#86 and # 85 are the "switch" (actually a coil). When power is applied to #86, it closes the contacts between #30 and #87, making the circuit, the hot at # 86 never sees the fan motor.
So, the switch would go inline between the ign source and the terminal #86.
Now, the one thing I do see after rereading your post, is the temp switch sounds like it is just a ground? So, basically it grounds at the intake and has 1 wire coming from it?
If so, The only change to Royces' drawing would be the 1 wire from your switch would go to #85, and #86 would go right to a switched ign source, so in your application the switch shown in Royces drawing would be between ground and #85, not between ign and #86. Basically you are just switching the ground.
Does that make sense?

Sean

1968 rs with an old school 354" SB2.2 pump gas motor.

Repetition does not transform a lie into a truth.

Franklin D. Roosevelt
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post #7 of 8 (permalink) Old Oct 19th, 07, 08:41 AM
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Charlie
 
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Re: Fan Relay Wiring

86 is your power source for the relay. If you want the fan to run after the key is turned off then hook 86 to a constant 12v. If you want the fan to shut off with the key, then hook 86 to a switched 12v source. 87 goes to the positive lead from the fan. 30 goes to the fan switch. 85 is the ground for the relay. This is exactly how I have mine hooked up.

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Last edited by 67CamaroRS/SS; Oct 19th, 07 at 08:51 AM.
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post #8 of 8 (permalink) Old Oct 19th, 07, 10:49 PM Thread Starter
 
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Re: Fan Relay Wiring

Ok got it.Thanks guys. appreciate everyones help.
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