That amp puts out :
You have 3 dual 2ohm subs and the amp is not 1 ohm stable which means the you have 1 wiring options as follows:
That should give you about 2500 watts for three subs that can handle 6000. I would advise exchanging both and starting over. The subs are competition LOUD overkill that you'll never utilize the potential of, so, maybe exchange them for something that can handle 1000-1500 watts apiece, x3, still a LOT of power.
- OR -
If you're set on keeping the three subs, return that amp ($399 ?) and get something get an amp that is 1 ohm stable like this ($319):
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It's a real 5K amp.
You can them wire the 3 subs like this:
And with it wired to 1.3ohms, that amp will push 4500+ watts to the three sundowns, might blow your windows out too, but hey, that's what insurance is for, right?
Check with these guys on the alternator.
Customized High Output Alternators
apexhighoutputalternators.com
Fill out the form and they will get you a quote on several options that may work for you. I'm thinking a 340A with a lithium bank in the rear should be more than adequate.
You got a lot to consider. Sub enclosure, wiring kits, cable runs, 2nd battery, big 3 upgrade. Do you have a budget in mind? What are you going to put up front (or front and back) to keep up with those monsters in the rear?