My car alternator runs at 16 to 16.5 volts when I hit the gas, and 15v idling. This is scaring me and a new one is too expensive. It could be my computer or pulleys in the wrong too so I can't risk buying a new one and still having the problem. It turns off my speaker amplifier as soon as I hit the gas pedal. I put in a resistor between the battery positive to my amplifier power line and it reduced the voltage by 1v, so about 15v max now. The amplifier stays on now but there's another problem. The speaker starts stuttering when the volume is up and it has to play sustained low notes, so I think the resistor isn't allowing enough amps through. I need it to allow ~15 amps (amplifier fuses are 15amp), and it seems to only allow around 6 or 7 based on how much work the speaker can do. I'm not sure what exactly I need in Ohm's+amps/watts specs for a new resistor to do the trick while lowering my voltage from 16v to around 14v. Perhaps even a couple higher-ohm resistors in parallel to allow more amps through? Maybe a resistor is the wrong way to go about it? Voltage Regulators seem to only be low-amp and I don't know a thing about them. I just need a simple way to reduce about 2 volts while still allowing 15 amps through, and I don't know how or the proper math to figure it out. Resistors seem too skinny, so maybe a thicker resistor-wire would work, but at what ohm rating?