bamm89 Posted September 10, 2016 Report Share Posted September 10, 2016 I have a Volvo hu 650 head unit I pulled from salvage yard. I want to use it in my mail truck. I attached a aux plug to plug into cigarette lighter. However the display will not show on the screen. What wire on green plug is for the display and do I wire that with the positive? Thanks Link to comment Share on other sites More sharing options...
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