Ok JJ you are a legend, we are getting somewhere. If I earth the head unit to a solid ground and leave the outer sheath of the RCA grounded we have no noise, none what so ever not even with revs. Now the arial is not grounding properly either as the deck will not operate withouit an additional earth. Now on old Holdens I used to use the arial outer sheath as a ground for my decks befoe the days of amps became popular. Do you reckon this is also affecting things? Should I make sure it is grounded?
Regards A
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