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Frequently Asked Questions

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Battery Not Charging Properly

Why isn't my battery charging properly?

Typically, for an engine equipped with an alternator to properly charge the battery, it would have to be run at full throttle for more than 15 minutes at a time. There are several reasons why the battery would not hold a charge. Some possible causes to this as well as other alternator related problems include:

Battery Not Charging
  • Engine RPM too low
  • Inline fuse "blown" (if equipped)
  • Defective battery
  • Loose, pinched, or corroded battery ground leads
  • Loose, pinched, or corroded battery charge leads
  • Open, shorted, or grounded wires between output connector and battery
  • Defective diode (open or shorted)
  • Defective or improperly grounded regulator-rectifier
  • Diode installed incorrectly (reversed)
  • Damaged battery (shorted battery cells)
  • Excessive current draw from accessories
  • Damaged alternator magnets
  • Defective stator
Battery In State Of Overcharge
  • Severe battery vibration (missing or broken tie-down straps)
  • Battery rate of charge not matched to alternator output
  • Defective regulator
Headlamps Not Working
  • Inline fuse "blown" (if equipped)
  • Defective headlamps
  • Loose or corroded wires
  • Open, shorted, or grounded wires between output connector and headlamps
  • Light switch defective
  • Damaged alternator magnets
  • Defective stator

A good source for engine specifications and technical servicing information would be a Briggs & Stratton Repair Manual (Lookup Manual by Engine Model PDF). The correct Repair Manual for your model engine is often listed in your engine's Illustrated Parts List.

Repair Manuals are available for purchase through our websites Repair Manuals section or locally from a Briggs & Stratton Authorized Dealer.


Your best source of information regarding any engine concern would be a Briggs & Stratton Authorized Dealer. Your Briggs & Stratton Authorized Dealer has all the information relating to Briggs & Stratton warranty information, replacement engines, short blocks, parts, pricing, service/repair, specifications, etc.

For your convenience, we offer three easy ways to locate your nearest Briggs & Stratton Authorized Dealers:

  • Use our website's Service Center Locator.

  • Visit www.yellowpages.com and enter "Lawn Mowers" or "Engines-Gasoline" in the Category search field and your Postal Code in the Location search field.

  • Call the Briggs & Stratton Automated Hotline at (800) 444-7774. This hotline is available 24 hours a day / 7 days a week and features voice recognition technology to assist you in finding the Briggs & Stratton Authorized Dealers in your area. Automated maintenance tips, product information, and FAQs are also offered through voice activated menus.



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Our user community provides a place for users to ask and answer questions of one another. Our staff also participates in this community on a regular basis. Please note that your question may take more than 24 hours to appear. If you are in need of an immediate answer please review our frequently asked questions or contact a local service dealer .

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Please complete the form below to contact us with your question. Provide as much information as possible. We make every effort to personally answer all questions within 3 BUSINESS days. If you are in need of an immediate answer please review our frequently asked questions or contact a local service dealer.

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