Alternator – Fits Freightliner (Replaces Delco 10459604, 19020806, 321738)

$166.17 $265.00

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Alternator – Fits Freightliner (Replaces Delco 10459604, 19020806, 321738) is backordered and will ship as soon as it is back in stock.

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Product Details

This aftermarket 12V 100-amp alternator is designed to fit a range of Freightliner and Bluebird Bus models. As a key component of your vehicle's charging system, this high-output alternator for Freightliner ensures reliable power for your electrical system, compatible with various heavy-duty and medium-duty truck series.

It serves as a direct replacement for Delco part numbers 10459604 and 19020806, and also cross-references with other equivalents like 321738 and AL10018X.

Features a single-wire system for simplified installation.
Built with an external fan for cooling and a reliable internal regulator.
Designed for standard negative polarity electrical systems.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number	Notes
Rareelectrical	8078NA1	Manufacturer Part Number
Delco	10459604	OEM Interchange
Delco	19020806	OEM Interchange
Generic	AL10018X	OEM Interchange
Generic	321738	OEM Interchange for this application

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Freightliner trucks, this part is compatible with various heavy-duty and medium-duty models from the late 1990s through the early 2000s, covering multiple Caterpillar and Cummins engine configurations.

For Bluebird Buses, it fits models equipped with the Caterpillar 3126 engine from 1998 to 2003.

Brand	Model	Stroke	Years	OEM Part No.	Notes
Freightliner	FC80			10459604, 321738	Compatible
Freightliner	FL60			10459604, 321738	Compatible
Freightliner	FL70			10459604, 321738	Compatible
Freightliner	FL80			10459604, 321738	Compatible
Freightliner	HEAVY DUTY FL, FLC 112 / 120		1998–1999	10459604, 321738	With Caterpillar 3176, 3306, 3406 engines
Freightliner	HEAVY DUTY FL, FLC 112 / 120		1998–2001	10459604, 321738	With Caterpillar C-10 engine
Freightliner	HEAVY DUTY FL, FLC 112 / 120		1998–2003	10459604, 321738	With Caterpillar C-12 engine
Freightliner	HEAVY DUTY FL, FLC 112 / 120		1998–1999	10459604, 321738	With Cummins L-10 engine
Freightliner	HEAVY DUTY FL, FLC 112 / 120		1998–2001	10459604, 321738	With Cummins M11, N14 engines
Freightliner	HEAVY DUTY FLD 112 / 120		1998–2000	10459604, 321738	With Caterpillar 3176, 3306, 3406, C-10 engines
Freightliner	HEAVY DUTY FLD 112 / 120		1998–2003	10459604, 321738	With Caterpillar C-12, Cummins N14 engines
Freightliner	HEAVY DUTY FLD 112 / 120		1998–2000	10459604, 321738	With Cummins L-10, M11 engines
Freightliner	MEDIUM DUTY FL50	L6	1998–2003	10459604, 321738	5.9L 5882CC 359CID
Freightliner	MEDIUM DUTY FL50	L6	1998–2004	10459604, 321738	7.2L 441CID
Freightliner	MEDIUM DUTY FL50	L6	1998–2002	10459604, 321738	8.3L 8277CC 505CI
Bluebird Bus	ALL MODELS		1998–2003	10459604, 321738	With Caterpillar 3126 engine

Technical Specs

Product Type: Alternator
Amperage: 100 Amps
Voltage: 12 Volts
Fan: External
Regulator: Internal
Polarity: Negative
Other Technical Attributes: 1-wire system, Threaded I terminal, Combo pin/threaded R terminal
Dimensions: 10.0 x 10.5 x 0.3 inches
Weight: 18 pounds (8.16 kg)
Manufacturer Part Number: 8078NA1

What’s in the Box

1 x Alternator

Installation Notes

Disconnect the vehicle's battery (negative terminal first) to prevent electrical shorts.
Loosen the serpentine belt tensioner and remove the belt from the alternator pulley.
Carefully unplug the electrical connectors from the back of the old alternator.
Remove the mounting bolts securing the old alternator and lift it out of the engine bay.
Position the new alternator and fasten the mounting bolts to the manufacturer's specified torque.
Re-attach the electrical connectors to the new unit.
Route the serpentine belt over the pulleys and apply the correct tension.
Reconnect the battery (positive terminal first).
Start the vehicle and verify the charging system is operating correctly (check voltage at the battery).

Troubleshooting & FAQ

How do I confirm this alternator fits my truck?

Always check the detailed compatibility table. Verify your vehicle's model, engine, and year range against the list. It is also crucial to compare the OEM part numbers listed with the number stamped on your current alternator to ensure an exact match.

What is a "1-wire system"?

A 1-wire system refers to a simplified wiring setup where the alternator requires only one main wire (the battery charging wire) to function. This makes it a popular choice for custom builds and simplified wiring harnesses.

What are the signs of a failing alternator?

Common symptoms include dimming or flickering headlights, a battery warning light on your dashboard, a weak or dead battery that can't hold a charge, and strange noises like whining or grinding coming from the alternator.

The part number 321738 is listed for a gasket elsewhere. Why is it an alternator reference here?

It's common for part numbers to be reused by different manufacturers for completely unrelated components, especially across different industries (e.g., commercial trucks vs. marine outboards). For the Freightliner applications listed, 321738 cross-references to this type of alternator.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

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Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

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