Delco Remy 24V 70A 21SI Alternator Part No. 19010200

The Delco Remy 21SI alternator is a new 24V unit rated at 70 amps, supplied as each and identified by part no. 19010200. It is a twin leg mount alternator with internal regulation, CW rotation, and a weight of 7.08kg, so it is a substantial rotating electrical unit suited to applications that call for this exact configuration.

This alternator has an inside mounting leg dimension of 101mm, a mount centre to centre measurement of 198mm, a pivot hole diameter of 13mm, and an adjusting hole diameter of 1/2 UNC. The shaft diameter is 22mm, the pulley section is not applicable, and the unit is fitted with a trash screen.

As a Delco Remy 21SI series alternator, this unit is listed with a 24V system voltage and 70A power rating. The supplied information also notes a one year warranty, which gives the buyer a clear reference point when matching the unit to the vehicle or machine that originally used this style of Delco alternator.

Key Features

• New Delco Remy alternator
• 24V, 70A output
• 21SI series
• Internal regulator
• CW rotation
• Twin leg mount

Specifications

• Part no.: 19010200
• Brand: Delco Remy
• Product type: Alternator
• Series: 21SI
• Voltage: 24V
• Power rating: 70A
• New / Remanufactured: New
• Warranty: One year

Fitment guidance

• Fitment is listed across multiple heavy equipment makes including Atlas Copco, Case IH, Caterpillar, Champion, Clark, Cummins, Doosan/Daewoo, John Deere, Komatsu, Samsung, Terex O&K, and Volvo Construction.
• Sample listed applications include Atlas Copco ROC D7-RRC, Case IH AFX8010, Caterpillar 120H, 12G, 12H, 135H, 14M, 16H, 3126, 325C, 325DL, 330 and 330B, Champion 710A and 720A Series, Clark 75C, Cummins B5.9-C, Doosan/Daewoo DL200, DL250, DL300 and DX140 variants, John Deere 850, Komatsu D61EX-12/PX-12, GD650A-2, WA320-3 and WA380-3, Samsung SE and SL series machines, Terex O&K TXC series machines, and Volvo Construction EC and G series machines.
• The fitment listing is broad, so the correct match must still be confirmed against the part number, mounting dimensions, rotation, shaft size, and regulator type on the existing unit.
• Where a machine has been fitted with a different alternator during its life, dimensions such as the 101mm inside mounting legs and 198mm mount centre to centre can be just as important as the application name.
• If your existing unit differs in any of the key measurements, this alternator should be checked carefully before purchase.

Application and Buying Notes

When matching this Delco Remy 21SI alternator, start with the part number 19010200 and then compare the physical measurements: 24V, 70A output, twin leg mount, 101mm inside mounting legs, and 198mm mount centre to centre. Those details are the strongest checkpoints for confirming the unit is the correct replacement.

The internal regulator, CW rotation, 22mm shaft diameter, and 1/2 UNC adjusting hole are also important because alternators of the same general size can still differ in mounting and drive arrangement. The pulley section is marked not applicable, so the unit should be checked against the existing alternator rather than assumed from a visual match alone.

The note that this unit is fitted with a trash screen is useful when comparing to the removed alternator. If the original unit does not have the same mounting style, shaft size, or screen arrangement, the safest approach is to verify the application by part number before ordering.

This alternator is a new unit and is supplied each, with a one year warranty. For workshop or fleet use, confirming the exact application helps avoid downtime, especially on equipment where the electrical system relies on the correct 24V and 70A specification.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number 19010200 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type ALTERNATOR, Unit of Measure EACH, Warranty One Year, Inside Mounting Legs 101mm, Pivot Hole Diameter 13, Pulley Section Not Applicable, Rotation CW, Shaft Diameter 22mm, Voltage 24, Alternator Mount Twin Leg.

Additional published details for cross-checking include New / Reman. New, Weight 7.08kg, Product Group 1 ROTATING ELECTRICAL, Part No. 19010200, Brand DELCO REMY, Description Delco Alternator 24V 70A 21SI, Adjusting Hole Diameter 1/2 UNC, Pin Code IR209, Power Rating (Amp) 70, Regulator Type Internal.

Delco Alternator 24V 70A 21SI. Part number 19010200 should be checked first. Listed voltage is 24. Listed output rating is 70. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Twin Leg. Regulator type is Internal. Pulley configuration is Not Applicable. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 19010200, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

Compatibility note: Please confirm fitment using the part number 19010200, the 21SI series identification, and the physical measurements before ordering. Application listings are broad, so the existing alternator should be checked for 24V, 70A, twin leg mounting, CW rotation, 101mm inside mounting legs, and 198mm mount centre to centre.

FAQ

What is the part number for this alternator?

The listed part number is 19010200.

What voltage and amperage is it rated at?

It is a 24V alternator with a 70A power rating.

Is this a new or remanufactured unit?

This alternator is listed as new.

What mounting style does it use?

It uses a twin leg alternator mount with 101mm inside mounting legs and 198mm mount centre to centre.

Does it have an internal regulator?

Yes. The regulator type is internal.

What should I check before buying?

Confirm the part number 19010200, the 21SI series, 24V and 70A rating, CW rotation, 22mm shaft diameter, and the mounting measurements against the existing unit.