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<blockquote data-quote="Spr0ket" data-source="post: 1139518" data-attributes="member: 560341">Step 1: take out the ground isolator.Step 2: test each connection.Remove the RCAs from the head unit and see if the ground whine is still there.&nbsp; If it is, remove the RCAs from the amp (yes, this is different from removing them from the head unit).&nbsp; If the whine is gone when you remove the RCAs from the head unit, disconnect the antenna from the head unit.&nbsp; If the whine stops with the RCAs connected, the problem is in your antenna and you will need to replace it.&nbsp; If you&#039;ve gone this far, the problem is in the amp or after the amp.&nbsp; To test the hypothesis, redo the ground for the amp.&nbsp; You&#039;ll want to find BARE METAL or better yet, drill a completely new hole and bolt down the ground wires there.&nbsp; Seal off the hole with silicon (under carpet of course).&nbsp; If the wine is still there, remove one speaker at a time.A ground isolater is not going to solve a problem with a bad ground, it will help smooth out the flow of the DC current only.&nbsp; The only way to remove the whine is to find where it is coming from and fix it.</blockquote>

[QUOTE="Spr0ket, post: 1139518, member: 560341"] Step 1: take out the ground isolator. Step 2: test each connection. Remove the RCAs from the head unit and see if the ground whine is still there. If it is, remove the RCAs from the amp (yes, this is different from removing them from the head unit). If the whine is gone when you remove the RCAs from the head unit, disconnect the antenna from the head unit. If the whine stops with the RCAs connected, the problem is in your antenna and you will need to replace it. If you've gone this far, the problem is in the amp or after the amp. To test the hypothesis, redo the ground for the amp. You'll want to find BARE METAL or better yet, drill a completely new hole and bolt down the ground wires there. Seal off the hole with silicon (under carpet of course). If the wine is still there, remove one speaker at a time. A ground isolater is not going to solve a problem with a bad ground, it will help smooth out the flow of the DC current only. The only way to remove the whine is to find where it is coming from and fix it. [/QUOTE]

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