Bosch AL421X Alternator
OE Quality 60-Day Returns
Bosch
 Alternator (Remanufactured)

Bosch AL421X Alternator

Brand Bosch AL421X
Amperage Rating 50
Case Color Aluminum
Case Material Aluminum
External Fan Included Yes
External Regulator Included Yes
Fan Type Internal
New Or Remanufactured Remanufactured
One Wire Capable No
Original Equipment Manufacturer Names HI
Outside Pulley Diameter 72
Packaging Box
Plug Clock Rear View Main Mounting Ear at 6 O Clock 11
Plug Type 350
Pulley Groove Quantity 1
Pulley Included Yes
Pulley Type 1V
Pulley Type / Belt Type (Alternator) 1V
Regulator Type Internal
Rotation Direction Clockwise
Voltage 12
Product line Alternator (Remanufactured)
Fits Isuzu · 28 vehicles

Remanufactured unit. Built and tested for dependable charging performance.

Aluminum case. Lightweight construction helps support durability and heat management.

Internal fan. Helps move air through the alternator for efficient operation.

Cross-references 2912763340 and 2912769300 for the same application. See all 2.

$165.89Free shipping
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Bosch Remanufactured Alternator AL421X

The Bosch AL421X remanufactured alternator is built for 12-volt charging systems and 50-amp output applications. It is a direct-fit electrical charging component for select Isuzu Pickup, Amigo, and Rodeo models, with Bosch remanufacturing standards focused on performance and reliability.

Key Features

  • 12-volt alternator for charging system service
  • 50-amp amperage rating for specified Isuzu applications
  • Remanufactured Bosch Premium Alternator construction
  • Internal fan and internal regulator design
  • Clockwise rotation direction
  • Aluminum case and aluminum case material
  • Included pulley with 1-groove, 1V belt type
  • External fan included and external regulator included
  • Part number AL421X for ordering and catalog lookup

Product Details

Bosch Premium Alternators are remanufactured, tested charging units built for consistent electrical output in demanding vehicle systems. The AL421X uses a 12V configuration, internal fan, internal regulator, and clockwise rotation, with a single-groove pulley and 72 mm outside pulley diameter. This Bosch alternator is specified for select Isuzu Pickup, Isuzu Amigo, and Isuzu Rodeo applications that call for a 50 amp alternator. The AL421X part number is also useful when cross-checking replacement needs against OE-style catalog listings.

This part cross-references Bosch-style OE replacement listings for the same application.

Vehicle Fitment

  • Fits 1988-1995 Isuzu Pickup, N/A; to 50 amp alternator.
  • Fits 1989-1993 Isuzu Amigo, N/A; to 50 amp alternator.
  • Fits 1991-1992 Isuzu Rodeo, N/A; to 50 amp alternator.
  • Fits 1986-1987 Isuzu Pickup, N/A; optional, to 50 amp alternator.

Common Repair Uses

  • Charging system failure on Isuzu Pickup, Amigo, or Rodeo
  • Low battery charging output from a worn alternator
  • Dim lights or electrical instability caused by weak alternator performance
  • Noise or bearing wear from an aging remanufactured alternator replacement
  • Replacement for a 50 amp alternator application in select Isuzu models

Installation Notes

Verify the vehicle’s original alternator output, pulley style, plug type, and mounting configuration before installation. Confirm the 12-volt system, clockwise rotation, and 1V pulley setup match the existing unit. Use the AL421X part number and vehicle application details to confirm fitment for your Isuzu Pickup, Isuzu Amigo, or Isuzu Rodeo before replacing the charging component.

Quality Assurance

This Bosch remanufactured alternator is produced as a Premium Alternator line component and is designed, built, and tested for dependable charging-system service. Bosch remanufacturing standards support consistent fit and electrical performance for the listed applications.

Related reading

This part fits 28 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
1995IsuzuPickup2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1994IsuzuPickup2.3LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1994IsuzuPickup2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1993IsuzuAmigo2.3LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1993IsuzuPickup2.3LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1993IsuzuPickup2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1992IsuzuAmigo2.3LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1992IsuzuAmigo2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1992IsuzuPickup2.3LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1992IsuzuPickup2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1992IsuzuRodeo2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1991IsuzuAmigo2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1991IsuzuAmigo2.3LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1991IsuzuPickup2.3LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1991IsuzuPickup2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1991IsuzuRodeo2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1990IsuzuAmigo2.3LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1990IsuzuAmigo2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1990IsuzuPickup2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1990IsuzuPickup2.3LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1989IsuzuAmigo2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1989IsuzuAmigo2.3LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1989IsuzuPickup2.3LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1989IsuzuPickup2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1988IsuzuPickup2.3LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1988IsuzuPickup2.6LL4N/ATo 50 Amp Alternator; Alternator (Remanufactured)
1987IsuzuPickup2.3LL4N/AOptional; To 50 Amp Alternator; Alternator (Remanufactured)
1986IsuzuPickup2.3LL4N/AOptional; To 50 Amp Alternator; Alternator (Remanufactured)
Directly replaces or cross-references 2 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
29127633402912769300