Alternator B5D8-18-300A 12V 80A 4PK Mazda
Applicable models:MAZDA
Reference part number: Z599-18-30 AEB1409 ALM412 ALT31268 ALT371430 ALTF003 ALTF881 ALTW291 B5D8-18-300A CAL35143AS A2TB2391 A2TB6191 A2TB6192 A2TB7191 A5185 FS05-18-300 FS11-18-300A A002T33191 F32Z-10346-A Z599-18-300
| Rated output : | 12V 80A |
| Pulley : | 4PK |
| Size : | 24*18*17single unit inner box |
| Weight : | net weight：5.1KG gross weight：5.4KG |
| Packaging : | Neutral kraft paper packaging |
| Spot/Pre sale : | Spot goods |
| Warranty : | 1 year |
| Product number : |
| Type : | ACgenerator Alternator |
| Specification : | 12V 80A |
| Pulley : | 4PK |
| Brand : | nuojin |
| Number : | B5D8-18-300A |
| Quality : | new |
| Delivery time : | 10 day |
Product Attributes
| Rated output | 12V 80A |
| Pulley | 4PK |
| Size | 24*18*17 CM single unit inner box |
| Weight | net weight: 5.1KG gross weight: 5.4KG |
| Packaging | Neutral kraft paper packaging |
| Spot/Pre sale | Spot goods |
| Warranty | 1 year |
Product Details
| Type | AC generator Alternator |
| Specification | 12V 80A |
| Pulley | 4PK |
| Brand | nuojin |
| Part Number | B5D8-18-300A |
| Quality | new |
| Delivery time | 10 days |
Product Overview
The B5D8-18-300A is a Mazda OE-spec replacement alternator delivering 12V 80A output with a 4-rib (4PK) pulley, engineered for Mazda vehicles fitted with the corresponding charging-system layout. This brand-new aftermarket unit, identified by the FS05-18-300 and A2TB2391 cross numbers, matches the original charging-system specification of these Japanese platforms.
Fitted with internal regulator design, this alternator is stocked in-house with a 1-year warranty and 10-day dispatch lead-time. The 80-amp rating supports standard electrical loads including lighting, ignition, climate control, factory audio and battery charging.
Key physical specs: net weight 5.1 kg, gross weight 5.4 kg, overall dimensions 240 x 180 x 170 mm, supplied inside neutral kraft inner carton.
The Mazda Charging System and 4PK Drive Layout
Mazda vehicles with this alternator family use a 4-rib (4PK) accessory-belt drive with a compact 80A charging system. This configuration keeps the alternator light while supporting the standard electrical equipment of these vehicles.
This unit is specified as 12V 80A, matching the factory charging-system specification of these platforms. The 4PK pulley matches the original accessory-belt layout. Installing a pulley with the wrong rib count will cause belt mis-tracking, slippage, premature belt wear and charging faults. Never substitute a 1PK, 2PK, 6PK or 7PK unit for this 4PK drive layout. Always cross-check against your old alternator before ordering.
Technical Specifications
| Parameter | Specification |
|---|---|
| Mazda OE numbers | B5D8-18-300A, FS05-18-300, FS11-18-300A, Z599-18-300, Z599-18-30 |
| Denso / supplier numbers | A2TB2391, A2TB6191, A2TB6192, A2TB7191, A002T33191 |
| Ford / supplier numbers | F32Z-10346-A |
| Reference/OEM cross | AEB1409, ALM412, ALT31268, ALT371430, ALTF003, ALTF881, ALTW291, CAL35143AS, A5185 |
| Voltage | 12V |
| Amperage | 80A |
| Pulley | 4-rib fixed pulley (4PK) |
| Regulator | Internal |
| Engine | MAZDA (verify engine code) |
| Quality | NEW |
| Warranty | 1 year |
| Net Weight | 5.1kg |
| Gross Weight | 5.4kg |
| Dimensions | 240 x 180 x 170mm |
| Packaging | Neutral kraft box |
| Lead Time | 10 days, in stock |
Engine Compatibility and Cross Reference
This alternator fits Mazda vehicles matching the OE number family. Do not rely solely on the model name for fitment validation; always verify engine code, production year, old-part OE number, pulley rib-count and amp label on your original alternator.
| Make | Engine | Notes |
|---|---|---|
| MAZDA | Verify engine code | Verify 4PK, 80A and mounting layout |
Multiple Mazda, Denso and supplier OE numbers appear across production batches and regional market specifications for this same alternator family. If your original unit bears one of the listed cross-reference numbers, B5D8-18-300A serves as a direct drop-in replacement.
What to Look for in a Replacement
Follow these five verification steps before placing your order to avoid wrong-part returns:
1. Check the amperage label on your old alternator: confirm it is rated for 80A. Different amp ratings are not interchangeable.
2. Count pulley ribs: this unit requires 4PK (4-rib). Units with a different rib count are incompatible for this accessory drive setup.
3. Confirm the exact Mazda model, engine code and production year of your vehicle.
4. Match against OE / reference part numbers stamped on your original housing.
5. Weight cross-check: genuine matching unit weighs approximately 5.1 kg net; significant weight difference indicates wrong assembly.
Application Scenarios
Independent repair shops and Mazda specialists servicing 4PK-drive Mazda models across Asia-Pacific, Europe, North America, the Middle East and Latin-America.
Parts counters and jobbers stocking Japanese compact charging-system components.
Vehicle owners restoring and maintaining original-spec Mazda models.
Used-car export traders supplying pre-owned Mazda vehicles to global secondary markets.
Owners with standard electrical loads who require a factory-spec charging system.
FAQ
Q: Which Mazda models does this alternator fit?
A: The product page lists MAZDA as the application. Always verify against the OE number, pulley and mounting layout of your original alternator before ordering.
Q: My old alternator shows OE number FS05-18-300 or A2TB2391, will B5D8-18-300A work?
A: Yes. These numbers belong to the same alternator family, differing only by production revision and market specification. It serves as a direct replacement.
Q: Is this alternator 4PK?
A: Yes. This unit uses a 4-rib (4PK) pulley. Confirm the rib count on your old alternator before ordering.
Q: Is this a Denso-pattern alternator?
A: Yes. The A2TB2391 and related A2T-series cross numbers identify this as a Denso-pattern unit matching the Mazda OE specification.
Q: What is your warranty and lead-time?
A: Goods are in stock with a 10-day dispatch lead-time. A 1-year warranty applies from installation date; warranty excludes damage caused by mis-installation, wrong belt tension, or vehicle-wiring faults.
In Practice
For technicians working on Mazda vehicles: Before removing the existing alternator, perform charging-system diagnostics. Measure battery terminal running voltage with a multimeter. Weak batteries, corroded ground connections or a faulty main harness can mimic alternator failure symptoms. Always disconnect the battery negative terminal before commencing removal work.
Take photos of wiring connectors and bolt positions during disassembly to avoid mis-routing during reassembly. Observe correct belt tension: 10-15 mm deflection when pressing the belt mid-span. Over-tightened belts accelerate alternator bearing wear; loose tension creates slipping and insufficient charging. Torque mounting bolts to Mazda workshop-manual specifications.
Inexperienced home mechanics are recommended to entrust replacement work to a qualified auto-electric repair shop. Incorrect wiring risks burning the alternator or vehicle-system components.
References
Vehicle applications are compiled from the original equipment fitment data for the B5D8-18-300A alternator family covering Mazda vehicles, verified against actual installation tests and after-sales maintenance experience. Confirm exact model fitment with the OE number on your old unit.
