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i ran a mechanical fan on the same motor the elec fan is now on. the only change is i now have a bigger radiator, but it was originally installed on the stock one. can't say i noticed any power difference at all ?? if there was it was extremly minimal ..... biggest change was noise - much less from the electric. i have it wired thru a relay and thermal switch with fuses where they need to be and have never had a problem ?? if it's wired correctly with the right fuses and wire(amp rating) it should be no less reliable than a thermo fan set up on a $100,000 car ??