Why does the voltage spike while accelerating 1995 Ford Thunderbird LX V-8 - Automatic?
In any vehicle due to the pulley diameter on the alternator you
gain more energy while accelerating because the crank (your engines
muscle) turns it faster with the belt, along with power steering,
A/C, and water pump. So the faster your driving , the faster your
spinning the pulleys that branch off to take care of your
vehicle.