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As far as I know all Blaupunkt HU use the ISO plug.. it is the black cable (usually) DO NOT run the unit without any ground cable at all.. very dangerous it will burn your HU or cables as it will ground itself through any other cable it will find (speaker etc.).
take your time.. remove the connectors cut the small ground wire in the ISO plug. then ground it either on the pc case or into the same position you have grounded your pc (this cable sould be as short as possible and as thick as possible) try which gives you less noise. try to remove as much noise as possible before using the isolator. (sounds easier saying it than doing it)
you can download the manual of your HU from the blaupunkt site, if you don't have it. it has the diagams..if it is different than this one
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