Check the power connections at the battery and at the amp and make sure they are clean and tight . The amp needs 12 volt power to have the audio pass through it if there is no power there is no sound . It should not be in the head unit but you can bypass the amp to make sure .
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.