Re: 12-Volt Alternator

Posted by Bob M on June 30, 2002 at 07:04:21 from (24.169.120.138):

In Reply to: 12-Volt Alternator posted by John Martin on June 29, 2002 at 12:48:31:

John - Electrically, alternator doesn't care which way it turns - will generate electricity fine spinning either direction. However nearly all alternator fans are designed/optimized for CW (clockwise) rotation - to match the rotation of virtually all modern engines. But a CW fan WILL still pull air cooling thru the alternator when spun CCW (backward) - it just won't be quite as efficient.

There do exist cooling fans for CCW rotation. They are found on certain marine, light aircraft and small Detroit Diesel applications. Problem is finding one. Also straight blade, "universal" or "dual rotation" alternator fans exist - these work equally well in either direction.

For the typical tractor 12 volt conversion, reverse rotation of the alternator is acceptable - the alternator is so lightly loaded the modest reduction in cooling air by it's spinning the "wrong" way will not a problem. I'd go ahead and use your alterator as is. ...Bob M

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