This page lists 24 electrical parts for the 2003 Hummer H1, across 5 part types, covering the 6.5L V8 DIESEL Turbocharged engine. Every part shows its brand, manufacturer part number and fitment notes.
The electrical system on the 2003 Hummer H1 covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. The largest groups are Alternator / Generator (10 parts), Speed Sensor (8 parts) and Starter Motor (3 parts). The other 2 part types cover the remaining 3 parts.
The 2003 Hummer H1 came with a single engine, the 6.5L V8 DIESEL Turbocharged, and every part is verified against it.
14 brands supply electrical parts for the 2003 Hummer H1, led by STANDARD MOTOR PRODUCTS (4 parts), TERREPOWER (3 parts) and WAI GLOBAL (2 parts), plus 11 more brands. Quality grades include Remanufactured, Economy and Standard Replacement.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2003 Hummer H1. 4 parts have it, including WAI GLOBAL 8219N (Alternator / Generator) and SKP SK917618 (Speed Sensor). Each part number opens a page with every vehicle that part fits.
Alternator / Generator
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL Popular | 8219N | 🇺🇸 US 🇨🇦 CA | with Standard EquipmentCS144 Series | View on Amazon |
| BOSCH | AL8577N | 🇺🇸 US 🇨🇦 CA | Standard124 Amps | View on Amazon |
| PURE ENERGY | 8219604N | 🇺🇸 US 🇨🇦 CA | 140 Amps | View on Amazon |
| TERREPOWER | N82195 | 🇺🇸 US 🇨🇦 CA | 140 Amps | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL Popular | 8219R | 🇺🇸 US 🇨🇦 CA | Power Select Reman | View on Amazon |
| ACDELCO | 3342452A | 🇺🇸 US 🇨🇦 CA | GoldRemanufactured | View on Amazon |
| FVP | 8203604 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| PURE ENERGY | 8203604 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| REMY | 21095 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER | 82035 | 🇺🇸 US 🇨🇦 CA | RemanufacturedSquare connector | View on Amazon |
This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator.
10 Alternator / Generator parts for the 2003 Hummer H1 come from 7 brands — WAI GLOBAL, PURE ENERGY, TERREPOWER and 4 other brands. The "Popular" part is WAI GLOBAL 8219N.
The New section lists 4 options from WAI GLOBAL, BOSCH, PURE ENERGY and 1 other brand — brand-new units rather than rebuilt ones. WAI GLOBAL 8219N is listed in this group.
The Remanufactured section lists 6 options from WAI GLOBAL, ACDELCO, FVP and 3 other brands — factory-rebuilt units with new wear components. WAI GLOBAL 8219R is listed in this group.
Battery Terminal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DEKA | 00351 | 🇺🇸 US 🇨🇦 CA | Universal Terminal for side terminal batteries | View on Amazon |
This table covers the terminals and clamps that connect cables to the battery posts.
One part is listed for the 2003 Hummer H1 — DEKA 00351.
Speed Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKP Popular | SK917618 | 🇺🇸 US 🇨🇦 CA | Screw-In Type | View on Amazon |
| ATP | JE18 | 🇺🇸 US 🇨🇦 CA | Transmission SpeedAutomatic Trans. | View on Amazon |
| STANDARD MOTOR PRODUCTS | SC168T | 🇺🇸 US 🇨🇦 CA | T-SeriesScrew-In Type | View on Amazon |
| UNITED MOTOR PRODUCTS | ABS297 | 🇺🇸 US 🇨🇦 CA | Screw-In Type | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA Popular | 501007 | 🇺🇸 US 🇨🇦 CA | Fits Transmission SpeedInput | View on Amazon |
| PIONEER | 771091 | 🇺🇸 US 🇨🇦 CA | Fits Transmission SpeedInput | View on Amazon |
| PIONEER | 771092 | 🇺🇸 US 🇨🇦 CA | Transmission SpeedAutomatic Trans. | View on Amazon |
| STANDARD MOTOR PRODUCTS | SC168 | 🇺🇸 US 🇨🇦 CA | Screw-In Type | View on Amazon |
This table covers the speed sensors on the transmission, transfer case or ABS ring. Typical signs include a dead speedometer, harsh transmission shifts, or a code for vehicle speed. Inspect the tone wheel and the connector before replacing the sensor.
8 Speed Sensor parts are listed for the 2003 Hummer H1, from STANDARD MOTOR PRODUCTS, PIONEER, SKP and 3 other brands. SKP SK917618 carries the "Popular" badge.
In the Economy grade, SKP, ATP, STANDARD MOTOR PRODUCTS and 1 other brand supply 4 parts: the catalog's value-priced group. A representative part number is SKP SK917618.
The Standard Replacement section lists 4 options from PIONEER, ROSTRA and STANDARD MOTOR PRODUCTS — built to original-equipment specification. ROSTRA 501007 is listed in this group.
Listed part numbers: SKP SK917618, ATP JE18 and STANDARD MOTOR PRODUCTS SC168T, plus the other parts above.
Starter Motor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | 6608S | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| REMY | 26041 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER | 6608 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor.
3 Starter Motor parts for the 2003 Hummer H1 come from 3 brands — FVP, REMY and TERREPOWER.
Part numbers include FVP 6608S, REMY 26041 and TERREPOWER 6608.
Starter Solenoid
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | SS251T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | SS251 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Starter solenoids. Typical signs include a harsh or missing shift, or a code for this solenoid circuit. Check resistance and the connector before dropping the pan for a solenoid.
2 Starter Solenoid parts for the 2003 Hummer H1 come from STANDARD MOTOR PRODUCTS.
The Economy section: 1 option from STANDARD MOTOR PRODUCTS. STANDARD MOTOR PRODUCTS SS251T is listed in this group.
Standard Replacement: 1 part, from STANDARD MOTOR PRODUCTS. A representative part number is STANDARD MOTOR PRODUCTS SS251.
Part numbers include STANDARD MOTOR PRODUCTS SS251T and STANDARD MOTOR PRODUCTS SS251.
Buying Electrical Parts for a 2003 Hummer H1
On this vehicle, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors.
- Confirm you have the 6.5L V8 DIESEL Turbocharged engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Alternator / Generator and Speed Sensor .
Frequently Asked Questions
How many electrical parts fit the 2003 Hummer H1?
Our catalog currently lists 24 electrical parts for the 2003 Hummer H1 across 5 subcategories and 14 brands, covering the 6.5L V8 DIESEL Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical problems on a 2003 Hummer H1?
Common symptoms include slow cranking on cold mornings, a battery light that flickers, dim lights at idle, or a check-engine code pointing at a sensor circuit. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2003 Hummer H1 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2003 Hummer H1?
Every part on this page is matched to the 6.5L V8 DIESEL Turbocharged engine. Then test before replacing — a failed alternator and a bad ground can look identical, and sensors are frequently condemned for wiring faults. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2003 Hummer H1
Electrical Parts for Other Hummer H1 Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.