Umm, this is absolutely, completely and irrefutably wrong. The increased electrical load places AT LEAST AS MUCH LOAD on the engine. Always. Claims to the contrary are precisely equivalent to claims of perpetual motion. They have as much validity as claiming to have a ghost-powered fan.
You've said this before. Try a bicycle generator before you make it very clear (again) that you didn't pay attention in high school physics.
Who brought up perpetual motion? Tell me how an altinator only produces power as needed? please I'd really like to understand this magical concept. The alt in your vehicle runs your lights, accessories,etc and tops up the battery in your vehicle with the excess power. Thats out of a chiltons book.
Now in all fairness lets consider your "bicycle generator". Your claiming you need more power to run more accessories, this is true in the sense that you have to pedal faster to produce more power. 100rpm = 1 watt, 200 rpm=2watt and so fourth. The point is if your altinator is running at 1 000rpm constant its going to produce 10 watts regardless of whether you use it or not! The altinator cannot produce neither more or less that that. Because the power production is based on the rpm of the altinator.
( if you wanna call this one I'd like to see proof of your claim )
Where would the drag be eliminated? Quite simple, the fan would draw from the battery and the battery would be recharged as per NORMAL. Therefor eliminating the "drag" on the engine. You are NOT creating energy from nothing, your vehicle is still operating as normal. ( I run a microhydro system for my lights at home, how full my batteries are charged is in comparrison to the flow which affects the RPM of the alt's I use. If they run at 600rpm, they produce a constant power, just like in your vehicle )
Now IF you were correct and IF I were wrong that leaves another question that noone has answered on here, how much HP does the mech fan really consume and how many watts does the elec fan require? what is the difference and therefor what is the real increase or savings in fuel and how long would it take to make it worth while to do the conversion? This is the info I believe is what everyone wants to know here; not "don't do it it wont work"...