Audio Systems: amp variance, alpine v12 amp, amp fuse

Question
I have been having problems with my amp readings going wild.  At the amplifier the readings will vary from 2-22amp extremely fast and the amplifier for my subs will just cut out siting current problems.  I believe that I have already ruined both my subs and need to find a solution before reconnecting my equipment.  Will a cap help, or finding a new ground position(is the negative terminal of my battery an option).  I am running an Alpine V12 amp(600w) if that helps at all.  

Answer
I'm trying to understand exactly what you are refering too.  it sounds like you put a meter on the power wire going to your amplifier and are reading the amps that its drawing?  Or there is a meter on the amp that shows this?  Either way, the fact that it spikes up and down is basically perfectly normal for an amplifier.  the amplifier will draw spikey amounts of juice as it makes spikey bass.  most bass is in the form of a beat and each time the amplifier has to push the speaker in the beat, it will draw more current to do so.  My amplifier goes between 2-150 amps at the blink of an eye and that's just how it is.  this is why car batteries stink for runing amplifiers and capacitors are better, since batteries dont deal with spikey loads very well.
The position of the ground probably doesnt have much to do with it but it does need to be bolted down, not just screwed down, in other words, a machine screw that has a nut on the other end, cranked down hard and against unpainted metal.  I like to use sandpaper on both sides of the hole, make them shine like chrome then bolt the ground terminal down tight, them paint over top to keep rust and corrosion out.  also use ring terminals of course, dont just clamp a piece of stripped wire down.
it's also very important to use the right gauge of wire and the right fuse at the battery.   this amp should probably have 8 gauge power and ground wire and a 60 amp fuse at the battery.