Usually an external ground connection may be required if there is an audio hum present after hooking up the turntable to the amplifier.If no hum is present,then the ground cable may not be required to be connected.Also check the audio quality on play back.The ground circuit is normally completed through the RCA plugs of the right and left channels.
See if you can attach the ground wire to a point on the chassis of the device you are connecting it to.
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