Subaru Legacy parasitic battery drain causing complete discharge in four days on Subaru Legacy

Some Subaru Legacy owners report experiencing parasitic battery drain issues that can lead to a complete discharge within four days. This problem can stem from various factors, including inactive electrical components, faulty wiring, unnecessary accessories, short circuits, or malfunctioning alternators. Symptoms often include rapid battery discharge, where the battery loses charge unexpectedly, which can result in sulfation and reduced capacity over time. To diagnose the issue effectively, a professional may conduct a systematic test of the vehicle's electrical system to monitor current draw and identify faulty components. If left unaddressed, this parasitic drain can result in a dead battery without warning, potentially leaving drivers stranded. Repairing this issue typically costs up to $200, but actual costs may vary based on the severity of the problem. Prompt resolution is essential to prevent further battery issues and potential vehicle breakdowns.