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Re: Controlling fan with Terminator x Fan Control circuit
Since either method requires a relay and wiring to the fan I would try using the ECU to controller the fan first and if it turns problematic then add the external controller.
It may be the relay control voltage from the ECU is not 12v DC. A little research on the ECU will show if the fan control signal is 12v DC. If not then plan ahead to use a relay style that comes in both the ECU voltage and 12v DC. That way it will be just a matter a matter of swapping one relay for another and changing the relay control wiring from the ECU to the new external controller if the Teminator proves problematic.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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