Briggs & Stratton Spark Plug Leads & Caps
Genuine Briggs & Stratton spark plug leads and caps deliver high-voltage current from ignition coils to spark plugs. We hold spark plug leads and caps in stock and sell worldwide. High-tension leads feature insulated cores protecting against voltage leakage to ground, rubber or silicone boots sealing connections from moisture and debris, internal resistance typically 2,500-5,000 ohms preventing radio interference. Common failures include cracked boots allowing spark arcing to ground, corroded terminal connections increasing resistance weakening spark, damaged insulation from heat exposure creating voltage leaks, loose wire attachment inside coil body causing intermittent spark. Resistance testing identifies failed components.
Available Briggs & Stratton Spark Plug Leads & Caps
Ignition Switch
1686734SM
Briggs & Stratton
£25.30
In Stock
Switch, Ignition
1401149MA
Briggs & Stratton
£18.75
In Stock
Key, Ignition
84009662
Briggs & Stratton
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Module-Ignition
706717
Briggs & Stratton
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Switch, Ignition, 5 P
5020836SM
Briggs & Stratton
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Coil, Ignition
150558040
Briggs & Stratton
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Hrnss, Ignition Switch
B4825GS
Briggs & Stratton
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Ignition Unit
TR00144A
Briggs & Stratton
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Coil, Ignition
293013
Briggs & Stratton
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Cable, Ignition
294519
Briggs & Stratton
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Key, Ignition
5106252
Briggs & Stratton
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Ignition Assy
5012C
Briggs & Stratton
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Frequently Asked Questions
What resistance reading indicates a faulty spark plug lead?
Test secondary circuit resistance connecting multimeter probe to spark plug boot terminal and ground lead to coil mounting flange. Normal readings range 2,500-5,000 ohms—some engines measure 4,000-13,000 ohms depending on lead length and design. Infinite resistance indicates internal wire break or poor terminal connection requiring coil replacement. Readings significantly below 2,500 ohms suggest internal short. Briggs & Stratton publishes no official specifications—resistance varies by model and coil type.
Can cracked or damaged spark plug boots cause weak spark?
Cracked boots allow high voltage arcing to ground instead of jumping spark plug gap—creates weak orange spark or no spark. Heat damage from exhaust proximity, oil saturation softening rubber, or physical stress splitting boot material all compromise insulation. Damaged boots also allow moisture and debris contaminating connection causing corrosion. Even taped repairs create transitional resistance problems eventually damaging coils. Replace boots showing cracks, splits, hardening, or oil contamination rather than attempting repairs.
How do I replace just the spark plug cap without replacing entire coil?
Most Briggs & Stratton coils have permanently attached leads—caps cannot be replaced separately. Aftermarket replacement boots exist for specific applications but require matching thread type and boot style. Some older engines use screw-on caps allowing replacement, but modern Magnetron coils integrate lead into coil body. Attempting to separate leads from coil body damages internal wire connection. If boot damaged and coil otherwise functional, carefully tape boot as temporary repair but plan coil replacement soon preventing coil damage.
What causes spark plug leads to fail prematurely?
Heat exposure from improper routing near exhaust manifolds or cylinder heads melts insulation allowing voltage leaking to ground. Wire chafing against sharp metal edges cuts insulation creating shorts. Oil contamination from leaking gaskets degrades rubber boots reducing insulation properties. Excessive pulling on boot when removing spark plugs stresses internal wire-to-terminal connection eventually breaking wire loose from coil pin. Physical impact from dropped tools or knocked components cracks brittle aged boots. Route leads away from heat sources preventing premature failure.
Why does my engine misfire despite new spark plug and good coil resistance?
Corroded terminals inside spark plug boot create high resistance despite good overall coil reading—disassemble boot checking terminal condition. Loose internal connection where high-tension lead attaches to coil pin causes intermittent spark—voltage jumps gap inside coil rather than at plug. Damaged boot insulation allows spark jumping to ground intermittently especially under load when voltage peaks. Oil-saturated boots conduct electricity reducing effective spark strength. Clean or replace boot ensuring proper metal-to-metal contact between lead terminal and spark plug terminal. Test with known good lead isolating problem component.