If the charging system voltage is hovering near 11.6 volts, stepping on the brakes will turn on the brake lights, dropping the voltage further and causing the computer to raise engine idle.

Question

Quizplus · Accepted Answer

When the charging system voltage is low (around 11.6 volts), turning on additional electrical loads such as the brake lights will further drop the voltage. The vehicle's computer detects this drop and compensates by increasing the engine idle speed to generate more power and stabilize the voltage.

If the Charging System Voltage Is Hovering near 11