Delphi Alternator 12V 100A, Part No. 55302178

The Delphi Alternator 12V 100A, Part No. 55302178, is a new rotating electrical unit supplied as each. It is specified with a 12 volt system, 100 amp power rating, internal regulator and CW rotation, so it suits applications that call for those exact electrical and mounting details.

Physical details matter with alternators, and this unit includes a twin leg mount, 131mm mount centre to centre, 10mm adjusting hole diameter and a 53mm outside diameter pulley. The pulley is 6 groove, which is an important point to check against the belt profile on the vehicle before ordering.

This alternator is listed for Delphi unit make, with pin code IR127 and a one year warranty. Because alternators are application-specific, the part number 55302178 and the measured mounting and pulley details should be matched carefully to the existing unit before fitment is attempted.

Key Features

• New alternator, supplied each
• 12V, 100A output
• Internal regulator
• CW rotation
• Twin leg mount
• 6 groove pulley

Specifications

• Part No.: 55302178
• Brand: Delphi
• Type: Alternator
• Voltage: 12
• Power Rating: 100 amp
• Regulator Type: Internal
• Rotation: CW
• Pulley Section: 6 groove

Application and Buying Notes

Before ordering, compare the existing alternator against Part No. 55302178 and confirm the mounting style, pulley arrangement and electrical setup. The key matching points here are 12V, 100A, internal regulator, CW rotation, twin leg mount and the 6 groove pulley with a 53mm outside diameter.

The 131mm mount centre to centre measurement and 10mm adjusting hole diameter are important because alternators that look similar can still differ in bracket spacing or slot size. If those dimensions do not line up with the vehicle or the removed unit, the alternator should not be assumed to fit.

This unit is listed as a Delphi alternator and is intended for Delphi unit make applications. Pin code IR127 is another useful identifier when comparing to the original component, particularly where the vehicle uses multiple alternator variants or where the previous part number is worn or unreadable.

Warranty is one year, which is helpful for peace of mind, but it does not replace the need to verify compatibility before purchase. The safest approach is to match the part number, voltage, amp rating, pulley section and mounting dimensions against the old alternator or vehicle application details.

If you are replacing a charging system component, it is worth checking the belt condition, connector style and physical clearance around the mount while the old unit is out. A correct alternator still needs the right pulley section, rotation and bracket alignment to install cleanly and operate as intended.

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 55302178 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, Pin Code IR127, Pulley Outside Diameter 53mm, Regulator Type Internal, Suits Unit Make Delphi, Alternator Mount Twin Leg, New / Reman. New, Product Group 2 ALTERNATORS.

Additional published details for cross-checking include Part No. 55302178, Brand DELPHI, Description Delphi Alternator 12V 100A, Adjusting Hole Diameter 10, Power Rating (Amp) 100, Pulley Section 6 Groove, Rotation CW, Voltage 12, Mount Cnt to Cnt 131mm, Product Group 1 ROTATING ELECTRICAL.

Delphi Alternator 12V 100A. Part number 55302178 should be checked first. Listed voltage is 12. Listed output rating is 100. 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 6 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 55302178, 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 compatibility using Part No. 55302178, 12V 100A output, CW rotation, internal regulator, twin leg mount, 6 groove pulley and the listed mounting measurements before purchase.

FAQ

What is the part number for this Delphi alternator?

The part number is 55302178. For this listing, part number 55302178 is the main reference point. Listed voltage is 12. Listed output rating is 100. These details should still be checked against the original unit before ordering.

What electrical specification does this alternator have?

It is a 12V alternator with a 100 amp power rating. For this listing, part number 55302178 is the main reference point. Listed voltage is 12. Listed output rating is 100. These details should still be checked against the original unit before ordering.

Does this alternator use an internal or external regulator?

It uses an internal regulator. For this listing, part number 55302178 is the main reference point. Listed voltage is 12. Listed output rating is 100. These details should still be checked against the original unit before ordering.

What pulley details are listed for this alternator?

The pulley is 6 groove and has a 53mm outside diameter. For this listing, part number 55302178 is the main reference point. Listed voltage is 12. Listed output rating is 100. These details should still be checked against the original unit before ordering.

What mount style is listed for this alternator?

It is listed with a twin leg mount and 131mm mount centre to centre, with a 10mm adjusting hole diameter. For this listing, part number 55302178 is the main reference point. Listed voltage is 12. Listed output rating is 100. These details should still be checked against the original unit before ordering.

Is fitment confirmed for specific vehicle models?

No vehicle models are provided here, so fitment should be confirmed by matching Part No. 55302178 and the listed specifications to the existing unit or application details. For this listing, part number 55302178 is the main reference point. Listed voltage is 12. Listed output rating is 100. These details should still be checked against the original unit before ordering.