im having a prob ive had a system in my car for a yr. all the grounds are good i did them over and over and over. just recently i got a new deck the alpine cda9815 (a good deck i may add) but it seems when i turn up the music and the bass hits harder it just cuts out. i reach about vol 20 and BOOM cuts out. i have a fostgate 1farat cap and the lights dim. this is the first time ever have the lights begun to dim. and also my battery gauge does drop. could it be the alternator or something thats not powering the battery?