on my fearing i have the radio and cb clarion.But he is not playing because the power in the fearing is not there.Have you somebody the plan or the piece.i try ti fing what kind of pieces is not there.I think is a preamplificator but i am not shure.If somebody can help me.I can buy it.I am living in Québec Canada.Thanks if you can help me.Excuse my english.An old 59 biker.