black magic (or any electrical) fan users

[Mach 1]

Originally posted by PKRWUD
Most electric fans, including virtually all factory electric fans are wired to a constant BAT+ source, rather than the ignition switch. The point is to cool it when it needs to be cooled, not just when you're in it. If when you stop and shut off the engine, the fan stays on for more than 5 minutes, either the sensor needs to be adjusted, or there is another problem in your cooling system. 90% of the time, the fan should have cooled enough to shut off before you go to restart. This means that there won't be another item competing with the starter.
Take care,
-Chris

While I agree with what you are saying 100%, it doesnt seem to work this way with the black magic for the mustang. My experience with this particular fan has been the fan running on and off intermittantly for HOURS after the engine is shut off. I think it is in the poor design of the thermostat sensor, as it heat soaks off the radiator after its cool, thus turning on again, and then the fan air cools it down...turns off..heat soak..on again..

I got so tired of people telling me my fan was running(and concerned about draining the battery) that I rewired mine also.