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Why doesn't my battery remain charged?

Why doesn't my battery remain charged?

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
Click to Visit the Repair Manual Section!

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

Repair Manuals are available for purchase 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.

NOTE: Please read and abide by any applicable Safety Information (PDF) before performing any engine work. This information is not meant to take the place of work performed by a Briggs & Stratton Authorized Dealer. Terms and Conditions apply to all of our information provided on this website. Always be sure to read and understand your engine Operator's Manual.

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  • Enter any equipment model numbers you may have


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  • 5HP=5, 18-1/2=18.5, 25=25.00


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  • What kind of product is the engine coupled to?


    Where was the equipment purchased?


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