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Barrette's Small Engines Inc. - SmallEngines.ca FAQ's

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





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