grounded where?

This post was edited by Beau on Mar 24 2012 12:25am

Id check all the grounds again. Alternator amperage? Battery(s) brand and specs?
Those Hfi's are thirsty amps and not very nice to alternators. Your right as far as these amps are very prone to pooing out mediochre bass on low voltage.
Id go atleast 200 amp alternator and maybe a 2nd battery.
Would guarantee no drops or dims then. I used a hfi 2000 with 2 yellowtops and a 200 amp alternator and it worked great. Needle didnt move and voltage stayed 14.3+

amp ground to what?

HFi's don't do rated you're probably trying to get 2500w out of it and cannot what's your electrical? 2500w is a lot with an inefficient amplifier like that if you're running stock I'm surprised ur only in the 12's and not the 11's on top of that of course your bass is gonna suck @ 12.5v it would on almost ANY amplifier most need 14.4v just to do rated.'

Also if your alternator is dropping it's probably due to heat, most vehicle charges sit around 13.5-14v if you're dropping to 12.5v without even bumping your system then you probably need your brushes cleaned or a new alternator, During the winter I rest @ 14.7v now I rest @ 13.8v when it's warm. I think you need a better amplifier and better electrical, instead of going for 2500w which is way more than those ATR's can handle get a solid 1000w amplifier from a good company.

You're going to blow that system for sure (type r's will prob go first.) I give it a week.

This post was edited by Hellish Orc on Mar 26 2012 11:48am

Maybe bad belt or voltage regulator. Try this i too dunno man.
http://www.google.com/url?sa=t&rct=j&q=alternator+drop+volttage&source=web&cd=1&ved=0CDUQFjAA&url=http%3A%2F%2Fwww.excelauto.com%2Fonline%2FTech.d%2Faltvdt.html&ei=PtNwT-a2KoKpiQKRnuWADQ&usg=AFQjCNESmG-po91m3Y91dAhiucN75UAy8g&cad=rja