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<blockquote data-quote="arex" data-source="post: 8079782" data-attributes="member: 654071">To put these questions in context; while I&#039;m familiar with basic electronics, I&#039;m very new to car audio and the nomenclature involved in it.&nbsp; I&#039;m building an adapter harness to mate a new HU to a factory amplifier, and I&#039;m confused by something.I understand that there are different sorts of grounds, but I&#039;m a little unclear on how and when to isolate them from one another.&nbsp; Also, I&#039;ve run into three different references to grounds between the HU harness, the adapter to the factory harness, and the line out converter, and I&#039;m not sure how they all go together.<ol>
<li data-xf-list-type="ol">Chassis Ground - I know what this one is.&nbsp; There&#039;s one on the factory harness and the line-out converter. 
</li>
<li data-xf-list-type="ol">Ground (SLD) - I don&#039;t know what SLD means.&nbsp; This is on the factory harness. 
</li>
<li data-xf-list-type="ol">Ground - This is on the HU harness.&nbsp; I don&#039;t know which of the previous two this would be.&nbsp; If it wasn&#039;t for #2, I&#039;d assume it was a chassis ground. 
</li>
</ol>Can anyone please clarify this for me?</blockquote>

[QUOTE="arex, post: 8079782, member: 654071"] To put these questions in context; while I'm familiar with basic electronics, I'm very new to car audio and the nomenclature involved in it. I'm building an adapter harness to mate a new HU to a factory amplifier, and I'm confused by something. I understand that there are different [I]sorts[/I] of grounds, but I'm a little unclear on how and when to isolate them from one another. Also, I've run into three different references to grounds between the HU harness, the adapter to the factory harness, and the line out converter, and I'm not sure how they all go together. [LIST=1] [*]Chassis Ground - I know what this one is. There's one on the factory harness and the line-out converter. [*]Ground (SLD) - I don't know what SLD means. This is on the factory harness. [*]Ground - This is on the HU harness. I don't know which of the previous two this would be. If it wasn't for #2, I'd assume it was a chassis ground. [/LIST] Can anyone please clarify this for me? [/QUOTE]

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