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Old 3rd Aug 2018, 12:55 pm   #4
Terry_VK5TM
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Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,324
Default Re: Vintage 70's 'Realistic' car radio wiring

Again, strange for it being black, but another possibility is it is connected to the lights circuit of the car so that the radio dial is illuminated when the parking or headlights are turned on.
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