Quote Originally Posted by I800C0LLECT View Post
Bottom line is that those sub notes cause a spike in power needs. A poorly designed power supply in an amp will not pull consistantly on the alternator and battery. If his voltage is dropping we don't know why just yet. If he has a 125amp alternator I would be shocked if that's the issue. His amps are rated a little less than mine and all I have is decent entry level equipment. My guess is that the 8awg from the alt. can't deliver on those power spikes and the battery can't keep up either. In these instances a cap can be a band aid. You can try the big 3 as well but like Matt said...this is a science.

Think it through so you don't waste time and effort on nonsense and think LONG TERM DESIGN too.
I'll try the alt to fuse box wire since I have the stuff for it, fast and free to check. If that don't help it is between a cap or a better amp, I don't feel comfortable enough to have a cap in my car so it will be a better amp.

Thanks for your help