Unlock the Right Part
for Your Repair
Find the exact part you need
Enter your model number to see parts that fit your machine.
Price Match Guarantee
In-stock parts ship the same day
365-Day Return Policy
Price Match GuaranteeChoose Product
Identify Problem
03
Find Solutions
HomeRepair HelpMTD Small Engine RepairMTD Small engine battery keeps draining Repair
MTD Small engine battery keeps draining
When an MTD small engine battery is draining, the charging system is usually the problem, especially when the engine battery will not hold a charge or the engine is not charging the battery while running. Start with the voltage regulator, the most likely cause. This part controls the voltage sent from the alternator to the battery, and a defective regulator can prevent the battery from receiving enough charge, causing it to die quickly. Next, test the alternator output with a multimeter. A failed alternator, also called a charging coil or stator on some MTD engines, can cause small engine battery not charging symptoms and other alternator problems. Check the battery and its connections as well, since a weak battery, corroded terminal, or loose ground can also mimic a charging-system failure. If the battery starts the engine and then quickly loses power, test the charging voltage before replacing the battery. Enter your MTD model number to find the exact replacement voltage regulator, alternator, battery, or other part for your specific engine.
01 - MTD Small Engine 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.
Enter model number to search for the required part specific to your product
Top Solution
02 - MTD Small Engine Alternator
To determine if the alternator is defective, use a multimeter to test the alternator output.
Highly Likely
Frequently Asked Questions
Why does my MTD small engine battery keep draining?
How do I test whether my MTD small engine is not charging the battery?
Can a bad battery cause my MTD small engine battery to keep dying?
What should I check before replacing the alternator on an MTD small engine?
How do I find the correct replacement part for my MTD small engine?
Shop by MTD Small Engine Parts
Shop by Popular MTD Small Engine Models
Our Story
Family-owned and operated since 1912, Burke America Parts Group is the longest-running genuine appliance, HVAC, and outdoor power equipment parts solution in North America. At Repair Clinic, we're proud to be an international brand trusted by the pros as well as the DIY community.
About Repair Clinic
© 2026 RepairClinic.com