altenator problem issue

You wouldn't happen to know if SPL changed (down) after reducing voltage drops, or adding a nearby battery? I anticipate not, but I/we might be lucky. Of course adding a nearby battery or reducing voltage drop by increasing the cable gauge etc might increase SPL - it will certainly increase average/RMS output power, but I expect that certain combinations will reduce the (peak) SPL. Ah - I love the car-audio scene. But that's because I'm NOT involved!

no i dont know because the system remained mostly unchanged since ive had it. the only thing that has changed was the switch from my red top optima to a bigger stinger battery. that switch happened after i stopped competing. i didnt notice a difference in sound after changing the battery but it did fix fix my gauge cluster from acting strange which is why i changed the battery in the first place. i will say that my old optima was a very good battery and it took a lot of abuse for about 5 years before it went bad.