Automotive Electronics Practice Test

What is the typical parasitic drain considered normal with multiple electronics in a vehicle?

1. 10 to 15 milliamperes

2. 20 to 30 milliamperes

3. 40 to 50 milliamperes

4. 60 to 70 milliamperes

The correct answer is: 20 to 30 milliamperes

A typical parasitic drain of 20 to 30 milliamperes is considered normal in vehicles equipped with multiple electronic systems. Modern vehicles are increasingly reliant on various electronic components for features such as security systems, infotainment, and onboard computers. These systems require a small amount of current even when the vehicle is turned off to maintain functionality and preserve settings. When assessing parasitic drain, it's essential to consider the cumulative draw from all the electronics, which can vary based on the type and number of accessories and systems present. A drain within the 20 to 30 milliamperes range strikes a balance, allowing necessary electronics to operate while remaining energy-efficient. Drain levels exceeding this range could indicate potential issues with electrical components or wiring that may need to be addressed to prevent battery drain and ensure reliable vehicle operation. In contrast, other ranges indicated are typically higher than what is generally accepted as normal, highlighting the efficiency improvements and design considerations in contemporary automotive electronics. Reducing parasitic drain is crucial for maintaining battery life and ensuring that vehicles start reliably after being parked for extended periods.