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Old December 8, 2012, 11:40 PM
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Arinoth Arinoth is offline
Join Date: May 2009
Location: Halifax
Posts: 9,158

If it's anything like a standard 3-pin fan connector then you have your 12 V, your Ground and your fan speed back (don't know what a pump normally reports back). The 4th pin would be to control it yourself (PWM pin) without volt modding (lowering the voltage to your fan/pump) yourself.
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