Alternators
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Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.
Quotation details: MOQ, availability, lead time, item condition (new or remanufactured) and warranty coverage must be confirmed in your quotation before ordering.
| Relationship | Reference family | Number |
|---|---|---|
| Primary Equipment Part Number | Isuzu alternator number | 1812004821 |
| Manufacturer Part Number | Denso alternator number | 101211-6321 |
| Superseded Equipment Number | Earlier Isuzu alternator number | 1812004820 |
| Related Manufacturer Number | Earlier Denso family number; verify configuration | 101211-6320 |
Product fitment guide
Quickly compare the reference number and recorded machine applications. Use the original photos and the checklist before ordering.
Part identification
Formatting aliases are the same number written differently. Cross-references require a specification and fitment check; they do not by themselves confirm direct interchangeability. Related assemblies and remanufactured numbers are separate relationship types.
Product summary
Before ordering
Machine fitment
2 model references
Fitment / evidence notes
Compatibility lists identify searchable model families, not every production serial range. Confirm the original part number and machine serial number before purchase.
Quick fitment answers
Recorded compatible model references include Engine family: Isuzu 6SD1 / 6SD1T, Excavator family: Hitachi EX330 / EX370. Recorded fitment/evidence notes: Fitment limitation: Confirm 1812004821, pulley, plug, mounting ears and serial range. Confirm the complete part number and machine serial range before ordering.
Manufacturer number: 101211-6321. Related assembly numbers (not direct interchanges): 101211-6320.
Confirm voltage and rated amperage against the original alternator label. Compare mounting ears, pulley type and pulley-groove count. Check plug shape, terminal position and regulator connection. Send clear photos of the original unit and connector layout when requesting a quote.
