How to address battery drainage issues in 2015–2019 Subaru Outbacks?

Content verified by Michael G.
October 28, 2024
Discover effective solutions for battery drainage issues in 2015–2019 Subaru Outbacks. Enhance your car's performance with our easy-to-follow guide.

 

Diagnose the Issue

 

  • Use a multimeter to check the battery voltage. A fully charged battery should read around 12.6 volts when the engine is off and above 14 volts when running.
  • Check for any error codes using an OBD-II scanner, which can highlight issues with the electrical system.
  • Inspect the alternator to ensure it's functioning properly as it is crucial for charging the battery while driving.

 

Inspect the Electrical Components

 

  • Review the car's electrical system, looking for any signs of faulty wiring or poor connections that may be draining the battery.
  • Consider components like headlights, interior lights, and infotainment systems which can drain the battery if left on.
  • Ensure all electronic components are turned off before leaving the vehicle.

 

Perform a Parasitic Draw Test

 

  • First, ensure that your vehicle is turned off completely and all doors are closed.
  • Disconnect the negative battery cable and connect a multimeter in series between the battery and cable to measure current draw.
  • A draw above 50 milliamps signifies that something in the car's system may be continuously drawing power.

 

Examine Aftermarket Accessories

 

  • If you've installed aftermarket electronics like alarm systems, they may be the cause of the drain.
  • Disconnect these accessories one by one to see if the issue resolves, which will help identify the culprit.

 

Clean Battery Terminals

 

  • Build-up of corrosion on battery terminals can impede the proper flow of electrical current.
  • Use a mix of baking soda and water to clean the terminals and ensure a good connection.

 

Consider Weather Conditions

 

  • Extreme temperatures can affect battery performance. Batteries tend to lose efficiency in cold weather and can overheat in warm temperatures.
  • If residing in an area with extreme weather conditions, consider using a battery insulation wrap to mitigate the effects.

 

Replace the Battery if Necessary

 

  • Batteries have a finite lifespan, usually about 3-5 years. If your battery is nearing the end of its expected life, replacement might be the best solution.
  • Ensure that the replacement battery meets the manufacturer’s specifications for optimal performance.

 

Consult a Professional

 

  • If you've done all of the above and the battery drain issue persists, it may be time to consult a professional mechanic who can conduct a more thorough inspection.
  • Provide them with the results from your previous diagnostics to help expedite the troubleshooting process.

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