This page lists 18 electrical parts for the 2003 Kenworth T300, across 3 part types, covering all 3 engine options (5.9L L6 DIESEL Turbocharged, 7.2L L6 DIESEL Turbocharged and 8.3L L6 DIESEL Turbocharged). Every part shows its brand, manufacturer part number and fitment notes.
The electrical system on the 2003 Kenworth T300 covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. All 18 listed parts are Alternator / Generator (11 parts), Starter Motor (4 parts) and Speed Sensor (3 parts).
The 2003 Kenworth T300 was sold with 3 engines. 7 parts fit every engine; the other 11 are engine-specific. Each part shows which engine(s) it fits.
4 brands supply electrical parts for the 2003 Kenworth T300, led by FAMOUS BRAND (10 parts), TERREPOWER (4 parts) and DORMAN (3 parts), plus 1 more brand. Quality grades include New and Remanufactured.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2003 Kenworth T300. 3 parts have it, including FAMOUS BRAND 7112490N (Alternator / Generator) and FAMOUS BRAND 7112715N (Alternator / Generator). Each part number opens a page with every vehicle that part fits.
Alternator / Generator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FAMOUS BRAND Popular Fits: all 2003 T300 engines | 7112490N | 🇺🇸 US 🇨🇦 CA | New Alternator160 Amps | View on Amazon |
| FAMOUS BRAND Popular Fits: all 2003 T300 engines | 7112715N | 🇺🇸 US 🇨🇦 CA | New Alternator200 Amps | View on Amazon |
| FAMOUS BRAND Popular Fits: 8.3L L6 DIESEL Turbocharged | 718707N | 🇺🇸 US 🇨🇦 CA | New AlternatorCummins ISC, Opt. Serv. Repl., DR 24SI Quad Pad MT., 145A | View on Amazon |
| FAMOUS BRAND Fits: all 2003 T300 engines | 717613N | 🇺🇸 US 🇨🇦 CA | Fits New AlternatorLeece Neville, Internal Regulator/External Fan, 160A, Trio Activated, 235MM Rotor Overall Lengthor New Alternator | View on Amazon |
| FAMOUS BRAND Fits: all 2003 T300 engines | 717613NLC | 🇺🇸 US 🇨🇦 CA | New Alternator160 Amps | View on Amazon |
| FAMOUS BRAND Fits: 8.3L L6 DIESEL Turbocharged | 7112716N | 🇺🇸 US 🇨🇦 CA | New AlternatorBOSCH IR/IF, REPL. UNIT, QUAD PAD MTG, 200 AMP | View on Amazon |
| FAMOUS BRAND Fits: 8.3L L6 DIESEL Turbocharged | 718362N | 🇺🇸 US 🇨🇦 CA | Fits New AlternatorCummins ISC, Delco 22SI, Quad Pad Mount, 100A | View on Amazon |
| FAMOUS BRAND Fits: 8.3L L6 DIESEL Turbocharged | 7112491N | 🇺🇸 US 🇨🇦 CA | New AlternatorBosch IR/if, Replacement Unit, Quad Pad Mounting, 160 Amp, Cummins ISC | View on Amazon |
| TERREPOWER Fits: 5.9L L6 DIESEL Turbocharged, 8.3L L6 DIESEL Turbocharged | 90014270 | 🇺🇸 US 🇨🇦 CA | RemanufacturedDoes Not Include Pulley | View on Amazon |
| TERREPOWER Fits: 5.9L L6 DIESEL Turbocharged, 8.3L L6 DIESEL Turbocharged | 90059124 | 🇺🇸 US 🇨🇦 CA | RemanufacturedDoes Not Include Pulley | View on Amazon |
| TERREPOWER Fits: 8.3L L6 DIESEL Turbocharged | 90014393 | 🇺🇸 US 🇨🇦 CA | RemanufacturedDoes Not Include Pulley | 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.
11 Alternator / Generator parts for the 2003 Kenworth T300 come from 2 brands — FAMOUS BRAND and TERREPOWER. The "Popular" part is FAMOUS BRAND 7112490N. 4 parts fit every engine; the other 7 are engine-specific.
Speed Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2003 T300 engines | 5055407 | 🇺🇸 US 🇨🇦 CA | with Eaton Transmissionwith External Tone Ring | View on Amazon |
| DORMAN Fits: all 2003 T300 engines | 5055408 | 🇺🇸 US 🇨🇦 CA | with Eaton Transmissionwith External Tone Ring | View on Amazon |
| DORMAN Fits: all 2003 T300 engines | 5055406 | 🇺🇸 US 🇨🇦 CA | with Eaton Transmissionwith Internal Tone Ring | 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.
DORMAN supplies the 3 Speed Sensor parts for the 2003 Kenworth T300. All of them fit every engine offered in the 2003 T300.
Listed part numbers: DORMAN 5055407, DORMAN 5055408 and DORMAN 5055406.
Starter Motor
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FAMOUS BRAND Fits: 5.9L L6 DIESEL Turbocharged | 726840N | 🇺🇸 US 🇨🇦 CA | Solenoid Positioned At 315 DegreesOpt Repl Delco 29MT | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TERREPOWER Fits: 5.9L L6 DIESEL Turbocharged | 91014313 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FAMOUS BRAND Fits: 7.2L L6 DIESEL Turbocharged | 7218936N | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WAI GLOBAL Fits: 8.3L L6 DIESEL Turbocharged | 18509N | 🇺🇸 US 🇨🇦 CA | Cummins EngineISC Engine Desg | 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.
4 Starter Motor parts for the 2003 Kenworth T300 come from 3 brands — FAMOUS BRAND, TERREPOWER and WAI GLOBAL.
The New section lists 1 option from FAMOUS BRAND — brand-new units rather than rebuilt ones. FAMOUS BRAND 726840N is listed in this group.
The Remanufactured section lists 1 option from TERREPOWER — factory-rebuilt units with new wear components. TERREPOWER 91014313 is listed in this group.
2 further parts sit outside the graded sections, with the same engine-level match.
Listed part numbers: FAMOUS BRAND 726840N, TERREPOWER 91014313 and FAMOUS BRAND 7218936N, plus the other parts above.
Buying Electrical Parts for a 2003 Kenworth T300
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.
- Match the engine first. Some electrical parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- 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 Starter Motor .
Frequently Asked Questions
How many electrical parts fit the 2003 Kenworth T300?
Our catalog currently lists 18 electrical parts for the 2003 Kenworth T300 across 3 subcategories and 4 brands, covering all 3 engine options (5.9L L6 DIESEL Turbocharged, 7.2L L6 DIESEL Turbocharged and 8.3L L6 DIESEL Turbocharged). Each part is matched to the engine(s) it fits.
Do electrical parts differ between 2003 Kenworth T300 engines?
Some do. 7 parts fit every engine; the other 11 are engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical problems on a 2003 Kenworth T300?
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 Kenworth T300 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 Kenworth T300?
First match the engine — each row shows which engine(s) the part fits. 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 Kenworth T300
Electrical Parts for Other Kenworth T300 Years
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