2003 GMC SIERRA 1500 HD Ignitions & Electrical - In Stock Filter Options - Vendor In Stock Filter Options

Summit Racing™ 145 Amp Alternator for Chevy, Buick, GMC, Cadillac SUM-810347

Alternator, Internal Regulator, 12 V, 145 amps, Natural Finish, Serpentine Pulley, Each

Part Number: SUM-810347

3.8 out of 5 stars ( 5 )

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ACDelco Vehicle Speed Sensors 24203876

Vehicle Speed Sensor, Buick, Chevrolet, GMC, Each

Part Number: ADO-24203876

Not Yet Reviewed

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E3 DiamondFIRE Heat-Sleeved Racing Ignition Wires E3.1509

Spark Plug Wire Set, GM LSX, 45 Degree, Fully Heat Sleeved, Racing Wire, Set

Part Number: ETP-E3-1509

3.5 out of 5 stars ( 4 )

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ACDelco GM Genuine Parts Replacement Horns 84594590

Horn, OE Replacement, Low Tone, 12 V, Buick, Cadillac, Chevy, GMC, Kit

Part Number: ADO-84594590

5.0 out of 5 stars ( 2 )

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Standard Motor Knock Sensors KS116K

Knock Sensor, Replacement, Wiring Harness, Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Pontiac, Kit

Part Number: SMP-KS116K

Not Yet Reviewed

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Summit Racing™ 88 Series 50 Ohm 8.5mm Ignition Wires SUM-887830

Summit Racing™ 88 Series 50 Ohm 8.5mm Ignition Wires SUM-887830

Spark Plug Wires, 88 Series, Street / Strip, 8.5mm, Black, 50 Ohm, 12" Leads, OEM Spark Plug Boots That Accept Heat Shields, LS, V8, Set

Part Number: SUM-887830

4.13 out of 5 stars ( 30 )

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MechMan Elite Series Alternators 8206320B

Alternators and Generators, Elite Series Alternators, 12 V, 320 amp, Serpentine, Gloss Black, Buick, Cadillac, Chevy, GMC, Hummer, Olds, Pontiac, Each

Part Number: MEH-8206320B

Not Yet Reviewed

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ACDelco Wiring Connectors 13585316

Wiring Pigtails, Replacement, Female Wire Connector Type, Buick, Cadillac, Chevy, GMC, Hummer, Isuzu, Oldsmobile, Pontiac, Saab, Saturn, Suzuki, Each

Part Number: ADO-PT2782

Not Yet Reviewed

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Denso Iridium TT Spark Plugs 4713

Spark Plugs, Iridium TT, Tapered Seat, 14mm Thread, 18mm Reach, Resistor, Each

Part Number: DNP-4713

4.29 out of 5 stars ( 7 )

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SQR Performance Spark Plug Wire Sets 126743

Spark Plug Wires, Silicon Insulated, Spiral Core, 8.5mm, Black, Straight Boots, GM, 4.8L, 5.3L, 6.0L, 6.2L, Set

Part Number: SQR-126743

5.0 out of 5 stars ( 1 )

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ACDelco Replacement Wiring Harness Connectors 19368859

Wiring Connector, GM 19368859, Cadillac, CTS, Gray Plastic, Each

Part Number: ADO-PT3846

5.0 out of 5 stars ( 3 )

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Delphi Ignition Coils GN10298

Ignition Coil, Coil Pack Style, Socket, Square, Black, Cadillac, Chevy, GMC, Hummer, Each

Part Number: DFP-GN10298

2.0 out of 5 stars ( 1 )

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Taylor ThunderVolt 8.2mm Spark Plug Wire Sets 84244

Spark Plug Wires, ThunderVolt, Spiro-Wound, 8.2mm, Red, 180 Degree Boots, Cadillac/Chevy, Pontiac, LS, Set

Part Number: TAY-84244

4.72 out of 5 stars ( 18 )

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Summit Racing™ High-Output Ignition Coils SUM-850501-1B

Ignition Coils, Coil Pack, D585 Style, Epoxy, Round, Black, LS, V8, Chevy, Cadillac, GMC, Buick, Hummer, Isuzu, Each

Part Number: SUM-850501-1B

Not Yet Reviewed

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Summit Racing™ 86 Series 8mm 300 Ohm Ignition Wires SUM-867828

Spark Plug Wires, 86 Series, 8mm, 300 Ohm, Blue, 9" Leads, OEM Spark Plug Boots That Accept Heat Shields, LS, V8, Set

Part Number: SUM-867828

4.14 out of 5 stars ( 14 )

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Powermaster PowerMax Starters 19109

Starter, PowerMAX, Mini, Standard Rotation, Chrome, Chevy, GMC, Pontiac, Each

Part Number: PWM-19109

Not Yet Reviewed

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MSD Multiple Spark Coils and Coil Kits 82868

Ignition Coil, MSC II Coil Pack, Epoxy, Square, Red, GM LQ Truck Engines, Set of 8

Part Number: MSD-82868

3.5 out of 5 stars ( 6 )

Estimated Ship Date: Feb 16, 2026 if ordered today

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Estimated Ship Date: Feb 16, 2026 if ordered today

NGK Laser Platinum Spark Plugs PTR5D-10

Spark Plug, Laser Platimun, Projected Tip, 14mm Thread, 0.708 in. Reach, Tapered Seat, Each

Part Number: NGK-3784

5.0 out of 5 stars ( 1 )

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Autolite XP Xtreme Performance Spark Plugs XP5245

Spark Plug, Resistor, Iridium Tip, Copper Core, 14mm Thread Size, 0.708 in. Reach, Tapered Seat, Each

Part Number: ATL-XP5245

3.0 out of 5 stars ( 1 )

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MSD Blaster OEM Replacement Coils 82653

Ignition Coil, Blaster OEM Replacement, Buick, Cadillac, Chevy, GMC, Isuzu, Hummer, Pontiac, Saab, Each

Part Number: MSD-82653

Not Yet Reviewed

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ACDelco GM Genuine Parts Remanufactured Alternators 88864281

Alternator, GM AD230 Case Style, 12 V, 105 amps, Internal Regulator, Serpentine Pulley, Cadillac, Chevy, GMC, Each

Part Number: ADO-334-2491A

4.2 out of 5 stars ( 5 )

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Bosch Premium Original Equipment-Type Oxygen Sensors 15282

Oxygen Sensors, Premium Original Equipment Type, Buick, Cadillac, Chevy, GMC, Hummer, Saab, Each

Part Number: BCH-15282

Not Yet Reviewed

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Taylor 409 Pro Race Spiro-Wound 10.4mm Spark Plug Wires 79205

Spark Plug Wires, 409 Pro Race, Spiro-Wound, 10.4mm, Red, Stock Boots, Chevy, GMC, LS, Set

Part Number: TAY-79205

4.59 out of 5 stars ( 54 )

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Interstate Mega-Tron Plus Automotive Batteries MTP-78

Battery, Mega-Tron, 12 V, Starting, 800 Cold Cranking Amps, Side Posts, Each

Part Number: ISB-MTP-78

4.8 out of 5 stars ( 10 )

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In Store Purchase Only

Delphi MAP Sensors PS10000

Sensor, MAP, Buick, Cadillac, Chevy, GMC, Oldsmobile, Pontiac, Hummer, Isuzu, Saab, Saturn, Each

Part Number: DFP-PS10000

5.0 out of 5 stars ( 1 )

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