Quote:
Originally Posted by 93Cobra#2771
That is technically correct, but unless you control it with a 94-95 ECM, either wire is high speed only.
The fan runs two speeds by ECM control. ECM grounds the fan at something like 6v or so for low speed, and when it wants high speed, it grounds another ground and supplies the fan with the full 12v...
So, either terminal will give you full power if using a switched souce...
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That's weird. So, why would you need two wires then?
Lee is correct on the Tarus fans. We have had 3 different fans and all had a noticable difference between 12V on the "high-speed" wire and 12V on the "low-speed" wire.