Ground Switched Outputs
Most computer outputs are controlled by the computer providing a ground for the circuit. An example is a
cooling fan relay. The relay coil has ignition switched power applied to it and the computer will provide a
path to ground when the relay is commanded on. A ground switched device will have system voltage at the
computer terminal when the device is off and a low voltage, very close to ground, when the device is on.
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- Winter '12
- JohnKelly
- The Circuit, Fan, Relay
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