> My bet would be that the black wire fuse is there for positive ground > vehicles, a vestige of times past. In that case, the black (negative) wire > is hot, and you would need the fuse there. > > Bob U. > AA6BT > > That is one reason, but the other is for the times you go directly to the battery with the negative lead. If the wire from the battery for the normal car's electrical system comes loose , the pathe for all the car's negative return is from the coax or frame of the radio to the black wire of the rig going to the battery.
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