You're probably right, but all stock on full tilt I only drop to about 13.5V at idle. Once I get the big 3 finished, run the 1/0 to the back, hook up the diehard platinum in the back, and rewire the sub to 1 Ohm I'll recheck my voltage at the amp. If it's too low I can get a 180 Amp Alt that bolts on directly.