Thanks for the reply man. But yea I saw today that when my battery is charged overnight or when I go to class, that when I come back, I am @ around 15 volts on the entire way home. Granted I dont have my dx400.4 installed yet, but I think the reason I dont have too much drop is because of the cadillacs stock wiring. SInce im sitting at 14.5-15 volts on average I think the cadillac stock battery is 16v. Also I was thinking about doing a big 3, but I heard that adding a second battery first would be most beneficial. What do you think?