WAI 13788N Alternator

Brand WAI 13788N
12 12
Fan Type Internal
Rotation Direction Clockwise (right)
Pulley Included Yes
Family Hitachi
Pulley Groove Quantity 4
Pulley Belt Type Serpentine
Regulator Type Internal
Decoupled Or Clutch Pulley No
Amperage Rating 70
Fits Mazda · 2 vehicles

100% new unit. Not remanufactured, with proprietary components and processes.

70-amp output. Provides the charging capacity needed for modern electrical loads.

Internal regulation. Built with an internal fan and internal regulator for compact design.

Cross-references BBB Industries 13788, BP4W-18-300B and BP4W-18-300C for the same application. See all 4.

$182.31Free shipping
In stock · usually ships same day before 1pm CST
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Step 2 — Quantity
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Free returns within 60 days if it doesn't fit when fitment is verified.

Overview

The WAI 13788N alternator is a 100% new electrical charging component built to deliver the amperage needed for modern vehicle electrical loads. It is engineered with proprietary components and processes for consistent output and long service life.

Key Features

  • 100% new alternator, not remanufactured
  • 70-amp output for charging system performance
  • Internal fan and internal regulator design
  • Clockwise rotation with a serpentine pulley setup
  • 4-groove pulley included
  • HITACHI family design

Fitment

Compatible with 1999-2000 Mazda Miata, N/A. This part number is 13788N.

Fits 1999-2000 Mazda Miata, N/A. The 13788N alternator is a direct replacement for the listed application and is relevant for Mazda Miata charging system service.

What It Helps Address

  • Low charging output from a worn alternator
  • Battery warning light caused by charging system faults
  • Electrical accessory performance issues under load
  • Charging instability from an aging internal regulator
  • Belt drive concerns related to pulley wear or mismatch

Installation Notes

Verify pulley type, groove count, rotation direction, and amperage rating before installation. Confirm the serpentine belt routing and electrical connections match the original unit. Use the vehicle’s service information to check charging system operation after installation.

Quality Assurance

WAI builds this alternator as a new unit using proprietary components and processes to support maximum life and performance. Part number 13788N is also cross-referenced to BBB Industries 13788 for the same application.

This part fits 2 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelNotes
2000MazdaMiata—
1999MazdaMiata—
Directly replaces or cross-references 4 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
BBB Industries — 13788BP4W-18-300BBP4W-18-300CLR170-758