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I was finally able to get a measurement. At idle with the alternator off, I see a draw of about 16 amps for both fans. At 70 MPH I see a draw of about 9 amps from the fans and there is definitely a spike in current draw when they start up, but there appears to be less of a spike than when idling. This seems to indicate that the fans do spin while driving down the highway, but at less than full speed. Not sure how the alternator being on affects this yet, but there are definitely power savings to be had from shutting the fans off on the highway. Although the reduction in alternator drag would be impossible to see on my MPG by itself, it will significantly save my battery when driving around with the alternator off and possibly extend the life of my alternator as well since it won't be working as hard.
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