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HomeRepair HelpSubaru RepairSubaru Small engine battery keeps draining Repair
Subaru Small engine battery keeps draining
If your Subaru small engine battery keeps draining, the charging system is not supplying enough voltage while the engine runs. The most likely cause is a defective voltage regulator, which controls the voltage sent from the alternator to the battery. When the regulator fails, the battery may not charge properly and can die quickly. The next likely cause is a faulty alternator. Test the alternator output with a multimeter to determine whether it is producing the required voltage. These charging-system problems can cause a small engine battery not charging, an engine that will not hold charge, or an engine that starts and then shuts down after the battery is drained. Check the battery and wiring after testing the regulator and alternator, since a weak battery or damaged connection can also prevent proper charging. Before ordering a Subaru small engine alternator or voltage regulator, enter your model number to find the exact replacement part for your specific engine. Repair Clinic can help you match the correct charging component to your Subaru model.
01 - Subaru Voltage Regulator
While the engine is running, the voltage regulator sends the proper amount of voltage from the alternator to the battery to keep the battery charged. If the voltage regulator is defective, the battery won't receive enough voltage, causing the battery to drain quickly.
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02 - Subaru Alternator
To determine if the alternator is defective, use a multimeter to test the alternator output.
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Frequently Asked Questions
Why is my Subaru small engine battery draining?
How do I test the alternator and voltage regulator on a Subaru small engine?
Could the battery be bad if my Subaru small engine is not holding a charge?
How can I find the correct Subaru small engine battery or charging part?
What should I check before replacing an expensive Subaru small engine part?