Briggs & Stratton Ignition & Electrical
Genuine Briggs & Stratton ignition and electrical parts include ignition coils, starters, alternators, voltage regulators, and safety switches for lawn mowers and garden equipment. We hold ignition and electrical components in stock and sell worldwide. Common failures include no-spark conditions from faulty ignition coils, sheared flywheel keys causing timing issues, charging system failures preventing battery charging, and worn starter motors. Proper air gap setting between coil and flywheel magnets ensures reliable spark generation. OEM electrical parts guarantee correct fitment and voltage specifications. We stock Briggs & Stratton ignition and electrical components globally for all engine series.
Available Briggs & Stratton Ignition & Electrical
Ignition Switch
1686734SM
Briggs & Stratton
£25.30
In Stock
Switch, Ignition
1401149MA
Briggs & Stratton
£18.75
In Stock
Alternator
592830
Briggs & Stratton
£50.10
In Stock
Alternator
84012663
Briggs & Stratton
£54.75
In Stock
Alternator
597491
Briggs & Stratton
£43.35
In Stock
Alternator
691991
Briggs & Stratton
£66.40
In Stock
Alternator
84012662
Briggs & Stratton
£50.10
Available
Alternator Stator
84012661
Briggs & Stratton
£44.80
Available
Alternator
592831
Briggs & Stratton
£54.75
Available
Alternator
592828
Briggs & Stratton
£56.80
Available
Alternator
794103
Briggs & Stratton
£39.55
Available
Harness Alternator
691955
Briggs & Stratton
£49.50
Available
Frequently Asked Questions
How do I diagnose charging system problems?
Identify alternator type by stator wire colour—AC systems use red/yellow wires, regulated DC systems use black wires. Test AC output at full throttle measuring 28-30 volts AC directly at stator leads. Regulated systems should produce 13.5-14.5 volts DC at battery. Voltage regulators fail when stator produces correct AC voltage but battery receives insufficient DC charging current. Check regulator ground connection quality and mounting bolt tightness. Verify flywheel magnets remain intact and properly positioned. Diode failures in DC systems prevent current flow to battery.
Why won't my electric starter engage the engine?
Failed starter solenoids prevent current reaching starter motor—listen for clicking sound indicating solenoid activation but starter failure. Test battery voltage under load—requires minimum 12.4 volts; weak batteries click but cannot turn starter. Worn starter drive gears (Bendix) fail to engage flywheel ring gear causing grinding noises. Corroded battery cables create excessive resistance preventing adequate current flow. Check starter motor brushes for wear and armature for shorts using multimeter. Flywheel ring gear damage from previous starter failures prevents proper engagement requiring flywheel replacement.
Why does my Briggs & Stratton engine have no spark?
Failed ignition coils (armatures) cause most no-spark conditions on Magnetron systems. Disconnect the kill wire from coil spade terminal and retest—if spark returns, wiring or safety switches fault to ground incorrectly. Verify air gap between coil and flywheel magnets measures 0.010-0.014 inches using feeler gauge or business card. Weak flywheel magnets prevent spark generation—magnets should attract screwdriver from one inch distance. Ensure coil mounting surface contacts engine block cleanly for proper grounding. Test spark at minimum 350 RPM using spark tester, not by hand-spinning flywheel.
What causes repeated flywheel key shearing?
Insufficient flywheel nut torque allows flywheel to slip on crankshaft taper, shearing keys repeatedly. Torque flywheel nut to specification (typically 55-150 ft-lbs depending on model) using torque wrench. Clean crankshaft taper and flywheel bore removing all oil, grease, or dirt—surfaces must create maximum friction. Blade strikes, loose blades, or intermittent spark from faulty ignition cause sudden stops shearing keys. Key smearing counterclockwise indicates loose flywheel; clockwise smearing suggests impact damage. Always use OEM aluminium keys designed to shear protecting crankshaft from damage.
Can faulty safety switches cause no-start conditions?
Safety interlock switches ground ignition coil preventing spark when seat unoccupied, blades engaged, or brake released. Bypass individual switches temporarily using jumper wires to isolate faulty switch—never bypass permanently creating safety hazards. Corroded switch connectors or damaged wiring create intermittent grounding causing random engine stopping. Seat switches wear from vibration, blade engagement switches fail from exposure to debris and moisture. Test each switch using multimeter checking continuity in both positions. Faulty safety switches can cause flywheel key shearing from intermittent spark during operation.