If you adjust a battery-charging alternator too high, what will happen to the battery?

When a battery-charging alternator is adjusted too high, it supplies excessive voltage to the battery during the charging process. This overvoltage can cause several adverse effects on the battery.

Primarily, the battery can become damaged due to the increased heat and gassing that occurs when it is overcharged. High charging voltage causes the electrolytic solution in the battery to heat up, leading to a process known as thermal runaway, which can evaporate electrolyte and damage the internal components of the battery. In addition, excessive charge can lead to the plating of lead sulfate on the battery plates, reducing the battery's efficiency and lifespan.

Overall, this situation highlights the importance of proper voltage regulation and control in battery charging systems. A well-maintained charging system ensures that batteries receive the appropriate voltage to charge effectively without causing harm.