Dual Spal Temperature switch
Thread Starter
Senior Member since 1492
Joined: Aug 2000
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From: Just because I'm paranoid doesn't mean people aren't out to get me...
St. Jude Donor '09
Dual Spal Temperature switch
Can you connect both the temperature gauge wire with the dual spal sensors? Or does the gauge need to have a second temperature switch?
Will the Spal wires work with the stock sensor & vice versa?
I'm thinking of having them all connect to the sensor in the head.
Len
Will the Spal wires work with the stock sensor & vice versa?
I'm thinking of having them all connect to the sensor in the head.
Len
Melting Slicks
Joined: Aug 2003
Posts: 2,135
Likes: 2
From: Dayton Oh
Great looking pic. I recommend NOT using the stock sensor or wire. If you do, then you're going to have problems. The stock sensor and temp guage are calibrated with each other...the sensor makes more resistance the higher the heat of the engine. Adding another device to the sensor will screw up the amount of resistance the temp guage is measuring. Would be much wiser to just use another water port.
Drifting
Joined: Dec 2002
Posts: 1,426
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From: San Diego, CA Website: ChrisMitchell.us
It looks like you bought the rad and fan combo from Tom DeWitt right? It should have come with its own sensor. That sensor will allow the fans to turn on and off at the correct temperatures. If you don't want to install it in the thermostat housing you should have another open port in one of the heads. I installed mine in the thermostat housing and have had no problems.
Melting Slicks
Joined: Jan 2003
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From: Where are the Smoky Mountain Cruisers? Not Correctly Restored Stingray
Originally Posted by rosslato
i've got the same setup. i put the sensor in the water port on the rite side of the intake manifold.
http://centechwire.com/catalog/cooling/fc2p.shtml
Last edited by 74 vert; Aug 11, 2004 at 07:42 PM.
Thread Starter
Senior Member since 1492
Joined: Aug 2000
Posts: 87,927
Likes: 156
From: Just because I'm paranoid doesn't mean people aren't out to get me...
St. Jude Donor '09
Originally Posted by 77Dream
It looks like you bought the rad and fan combo from Tom DeWitt right? It should have come with its own sensor. That sensor will allow the fans to turn on and off at the correct temperatures. If you don't want to install it in the thermostat housing you should have another open port in one of the heads. I installed mine in the thermostat housing and have had no problems.
Yes, but I wanted to reduce some of the engine compartment wiring.
Melting Slicks
Joined: Nov 2003
Posts: 2,668
Likes: 119
From: St. Charles Mo
CI 5 & 8 Veteran
Len, Marshrat99 is on the right track. The stock temp sensor is an analog variable resistor changing resistance with temperature. The Temp sensor supplied with the Spal fans is a discrete switch set to close the circuit to ground at ~170 degrees (not sure about the temp....depends on which temp sensor part you have) Using the stock sensor won't work. If you connect both fans to a single temp sensor, be carefull... the current surge of turning on both fans at exactly the same time took out the voltage regulator in my alternator.... even though I supposedly upgraded the alternator to handle 100amp. I replaced the voltage regulator and wired the secound fan to operate manually. So far I have'nt needed the secound fan, but the summer has been pretty mild here. I choose to hook my 12volt power source for the fans down at the starter B+battery terminal. I haven't had time to troubleshoot ....but if I have too much resistance in my alternator charging wire and/or my battery terminal, that might explain a reverse voltage spike that takes out the alternator regulator when running both fans???? Best to stagger the fan turn on.
Bullshark
Bullshark
"Rodstoration &am p;quot; In Progres
Joined: Jun 2004
Posts: 1,397
Likes: 1
From: Frisco TX
I recently finished my dual spal installation... just spliced the two black wires (one from each relay) together and attached to the temp sensor on the intake manifold. Kept it clean and works well... all it does is ground out the relay. I also installed a ground override switch in the car so that I can manually activate the fans if wanted/needed.
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