Hey team....so I have a 97 challenger and of course they do not have stereo systems. So last week I got fed up and decided to install four 6 1/2 with a marine grade Memphis deck. Ran all the wires cut holes for speakers and put deck in the cup holder cut out on driver side. System sounds amazing but when I start the boat in have no music, as soon as I turn motor off BAMMM music is back on. I wired it direct to the battery so I didn't have to worry about messing up factory wiring. Anyone know why this is happening ? Is it a volt regulator maybe? I figured since it's direct to battery there should be an issue. Help PLs