Re: Voltage drop is terrible after adding more batteries. :/
Double check all the wiring. Also have you done the Big 3? And it's possible that the alternator doesn't have enough juice to recharge that many batteries that quick, but I do not know for sure.
Bought From: mylows10, michaellane
Vehicle: 2000 Toyota Tundra (243,000+ Miles)
HU: JVC KW-500
Amp: RF R1200-1D and SoundQubed Q4-120.4 (Bridged in Parallel @ 2 Ohm to put out ~340W)
Subs: 2 SA-12s in 4 Cubes @ 32 Hz
Front Stage: CDT Audio -- ES-6iM (Mids), TW-125 (Tweets), EX-530 (X-Over)
275 Amp Singer alt being modified as it did not fit...