The blue wire is the tachometer lead for motherboards that have this option. Not useing it will not hamper the fans performance.
Clint Worley
Worley Technology

-- Harvey Rose <[log in to unmask]> wrote:
I'm replacing a power supply fan in a Pentium AT computer it has a red and
black wire which I need to change the connector to the new one which has a
red, black & blue wire. Do I need to connect the blue wire somewhere - is
it a ground?

Harvey Rose
[log in to unmask]

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