He said he had a T1000bd, not T1500bd. His amp probably never pulls more than 120 (conservative) at most and I highly doubt a T1500bd could ever pull close to 250 amps (probably not even 200) in a real world setup. DC Power also makes more than just 275-320a units. Please pay more attention to what you're reading and stop posting misinformation. That said, a good HO alternator will definitely remedy your voltage issues To the OP Sorry, I know this post did not pertain to you, in your case, I think I large kinetik would help but I doubt it will fix your problem. If you add the battery and turn the gain down, it might work out for ya. If you really want to keep your voltage up in the 14s though while giving your system a good workout, you'll likely need a HO alternator. The nice thing about upgrading your alt is that if you get a good one such as DC Power and get a fairly high amperage unit like a 250 or better, you probably won't need the extra/upgraded batteries on your current system.