Electrical Issues. Voltage Dropping

[asilayinruins]

I'm running a Mechman 270amp alternator, in my 2000 Chevy Blazer, that I purchased a couple years ago. Under my hood I'm running a XS Power D3400 battery. I'm running a Sundown Audio ZV4 18" sub (1750rms), on a Sundown Audio SAZ2500 amp (2500rms). Im having voltage issues. My battery never seems to ever reach 14 volts. It usually starts around 12-13 volts, and as I drive and play my sounds(not even bumping too loud), it usually drops below 12 volts. When I do try to crank my sounds loud, when big bass notes hit, it usually drops even lower, and then the sub/amp can't keep up, and skips during those deep notes.

I noticed the D3400 is good up to 2500 watts rms systems. But Sundown might be under-rating their products. Is my D3400 battery under my hood still good? Should I run another battery in parallel? What should I do?

Also could this be an alternator issue? The alternator not charging the battery properly?

I can't even push my Sundowns to nearly its peak. Hopefully my battery is still good, and will I need more power?

Thanks!

[Rmichael91]

Check your connections first. Big 3 done I'm assuming. If its in your budget pickup another battery, the D3400 probably isn't putting out enough to power the truck and amp on its own.