Adding a Second head unit?
Ok i have a 2013 ford fusion and i dont want to take out myford touch factory radio since it controls everything. I cant add an amp to it and i dont want to use an inline converter because they sound pretty bad. I was wondering how i could go about installing a second head unit. Id like to only use the sub and amp when the second head unit is on, but i want to also still hear sound from the factory speakers when the factory radio is off and second head unit on. Is there anyway i can do this?
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