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<blockquote data-quote="mikegett" data-source="post: 1965811" data-attributes="member: 561005"><p>No, a common ground just consits of all speaker wires sharing the same ground point.&nbsp; &nbsp; It won&#039;t damage your HU, but you will have to rewire the speakers to get them to work.&nbsp; &nbsp; I am refering to the old positive ground systems.&nbsp; &nbsp;&nbsp; Cars today use a negative ground.&nbsp; &nbsp;&nbsp; Alot of the older foreign systems were reversed and require a rewire of the radio or a polarity invertor.&nbsp; &nbsp; I realy don&#039;t remember a whole lot about them.&nbsp;&nbsp; I only had to deal with it once about ten years ago.&nbsp; &nbsp; I do know that the Jags were built with positive and negative ground systems deepending on the year and location produced.&nbsp;&nbsp; I believe due to the ford merger in 95.&nbsp; &nbsp;&nbsp; I will be able to check the HU easily when removing the deck.&nbsp; &nbsp; What I don&#039;t know is if the polarity issue will affect the speaker level going to the amp.&nbsp; &nbsp;&nbsp; I wouldn&#039;t think so, concidering that AC can be reversed with no problem.</p></blockquote><p></p>

[QUOTE="mikegett, post: 1965811, member: 561005"] No, a common ground just consits of all speaker wires sharing the same ground point. It won't damage your HU, but you will have to rewire the speakers to get them to work. I am refering to the old positive ground systems. Cars today use a negative ground. Alot of the older foreign systems were reversed and require a rewire of the radio or a polarity invertor. I realy don't remember a whole lot about them. I only had to deal with it once about ten years ago. I do know that the Jags were built with positive and negative ground systems deepending on the year and location produced. I believe due to the ford merger in 95. I will be able to check the HU easily when removing the deck. What I don't know is if the polarity issue will affect the speaker level going to the amp. I wouldn't think so, concidering that AC can be reversed with no problem. [/QUOTE]

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