Quote:
Originally Posted by ebacherville
...when id shut the car off in a slight wind blowing and the car faced into the wind it would stay running as the fan was being spun by the slight wind and powering the ignition cloil..
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This is very interesting!
In fact, since I can barely, or not even, hear my new electric fan, I wired a small light bulb across its power terminals and mounted the light bulb on my dash so I could monitor when the fan is running and thus be able to adjust its thermostat for best efficiency. Well, having done this, the first thing I noted is that the fan spins with the incoming air from vehicle motion, enough so that it lights the bulb, however dimly.
Actually, I am thinking that it is not desirable to have the fan spin when not being powered because that is putting undue wear on its bearings and brushes. I could configure a relay to put a dead short across the fan's power terminals when it is not being powered. This would greatly reduce its ability to freely spin, thus saving bearing/brushes wear.