We have a similar problem in our raptor ,but our rocker switchs on main panel seperate the living from the garage (we dont have any speaker switchs in the garage just light switchs)
fine but our problem is in order to listen to the outside speakers you have to turn it up so loud to get them on ouside it will bust your ears in the garage
,So I installed a stereo and speaker in the front basement compartment so now I dont have to go in and out to change channel and I even got a rock speaker to put outside so I can keep the basement door close,Will take pics later and post
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2008 F350 chipped and bagged 6.4 power stroke crew cab 4x4.2013 384pk Raptor (Gravy Train) 2006 Fatboy w/18inch ape hangers,2006 883c sporty,Army wife Kim,Cocoa (The Boarder Collie) and Rebel (The English Bulldog)
(THE RICH RAGE WAR,BUT ITS THE POOR THAT DIE)