I have a 2003 v6 mustang, with the mach 460 sound system, removed, and a complete aftermarket sony system, with a 2000watt power acustic amp, running 2 jbl 12's on a sealed box and a 1 farad cap. the stereo was installed on the original alternator,, which worked fine for the first year, then started having the battery light flash intermittantely, so I replaced the old Alternator with a 130amp alternator. Problem solved, until 2 weeks ago the lights started to slightly dimm with the bass hits. Which is getting progressivly worse, I have read the threads about the 4 gauge battery cables and I am considering that upgrade, But my questions is my hot wire connections on this system, my amp B+ wire goes to the B+ stud on the junction block under the hood (worked fine in all my chevy cars and my Mercury Sable) then it runs from there directly to the capacitor, and my ground goes from my capacitor to the chassis ground in the trunk, the amp is connected to the capacitor as well. Voltage gauge is in the normal range and no visible changes. Any suggestions, besides changing the Battery wires to 4 gauge or 0 gauge, wire?