Table of Contents
Upgrading your Subaru’s alternator can be a great way to support increased electrical demands, especially if you’ve added aftermarket accessories like high-powered audio systems, additional lighting, or other electronic devices. A higher-capacity alternator ensures your vehicle’s electrical system remains reliable and efficient.
Understanding Your Subaru’s Electrical System
Before upgrading, it’s essential to understand your current electrical system. Most Subaru models come with a factory-installed alternator rated between 90 and 150 amps. To determine your specific alternator’s capacity, check your vehicle’s manual or look for a label on the alternator itself.
Choosing the Right Replacement Alternator
Select an alternator that exceeds your current electrical load by at least 20%. For example, if your system demands 100 amps, opt for a 120-amp or higher alternator. Consider aftermarket brands known for durability and performance, such as Denso, Bosch, or Valeo.
Key Factors to Consider
- Compatibility: Ensure the alternator fits your Subaru model and year.
- Voltage: Most alternators operate at 12V, but verify compatibility.
- Mounting: Check if the mounting brackets align with your vehicle.
- Electrical connections: Confirm the wiring harness matches.
Installation Process
Installing a new alternator involves several steps, but if you’re comfortable with automotive repairs, you can do it yourself. Always disconnect the negative battery terminal before starting.
Tools Needed
- Socket set and wrenches
- Screwdrivers
- Belt tensioner tool
- Replacement alternator
Follow these general steps:
- Remove the drive belt from the alternator pulley.
- Disconnect electrical connections.
- Unbolt and remove the old alternator.
- Install the new alternator and tighten bolts.
- Reconnect electrical connections.
- Reinstall the drive belt and check tension.
- Reconnect the battery and start the vehicle to test.
Final Tips
After installation, monitor your electrical system for proper operation. Use a multimeter to check voltage output, which should be around 13.8 to 14.8 volts when the engine is running. If you notice issues, consult a professional mechanic.
Upgrading your Subaru’s alternator can significantly improve your vehicle’s ability to handle increased electrical loads, ensuring your accessories work reliably and your vehicle remains dependable.