Genuine Alternator 12V 100A Mitsubishi P51X18300B

This Genuine Alternator is a 12V, 100A unit for Mitsubishi applications and is listed under part number P51X18300B. It is a new alternator, supplied each, with an internal regulator and a quad leg mount, so matching the physical mounting and electrical specification matters before purchase.

Key details to confirm are the 12V charging system, 100 amp output, 6 groove pulley, 51mm pulley outside diameter, and the 10.5mm / M10x1.25 pivot hole diameter. These are the practical checks that help determine whether the alternator will suit the vehicle and the existing drive setup.

The unit is described as a Genuine Products alternator and carries IR140 as the pin code. It also has a listed weight of 5.24kg and comes with a 12 month warranty. If you are replacing an existing Mitsubishi alternator, comparing the part number and mounting details is the safest way to avoid a mismatch.

Key Features

• 12V alternator with 100A output
• New unit supplied each
• Internal regulator
• 6 groove pulley
• Quad leg mount
• Mitsubishi application listed

Specifications

• Voltage: 12
• Power rating: 100 amp
• Part number: P51X18300B
• Pin code: IR140
• Pulley outside diameter: 51mm
• Pulley section: 6 groove
• Pivot hole diameter: 10.5 / M10x1.25
• Alternator mount: Quad Leg

Fitment guidance

• MAZDA: CX-3, CX-3 2018, CX-3 2019, CX-5, CX-5 2016

Application and Buying Notes

Before ordering, compare the alternator’s part number P51X18300B with the unit already fitted to the vehicle. That remains the most reliable starting point, especially where Mitsubishi charging systems may have more than one alternator option across different engine or build combinations.

Also check the mounting layout and drive details carefully. This alternator is a quad leg mount with a 10.5mm / M10x1.25 pivot hole, a 6 groove pulley, and a 51mm pulley outside diameter. If any of those details differ from the vehicle’s current setup, the part may not bolt up or align correctly.

The 12V and 100A electrical specification is important when replacing a charging unit. Matching both the voltage and output helps keep the charging system consistent with the original design. The internal regulator and IR140 pin code are further checks that should be compared against the existing alternator or vehicle requirements.

Because fitment is not fully verified here, it is worth checking the vehicle details with care before purchase. A Mitsubishi alternator can still vary by model, year, engine, pulley configuration, and mounting style, so the safest approach is to use the part number first and then confirm the physical measurements against the old unit.

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 P51X18300B 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 12 Months, Pivot Hole Diameter 10.5 / M10x1.25, Pulley Outside Diameter 51mm, Regulator Type Internal, Voltage 12, Item Type Alternator, Weight 5.24kg, Product Group 1 ROTATING ELECTRICAL.

Additional published details for cross-checking include Part No. P51X18300B, Brand GENUINE PRODUCTS, Description Genuine Alternator 12V 100A Mitsubishi, Pin Code IR140, Power Rating (Amp) 100, Pulley Section 6 Groove, Suits Unit Make Mitsubishi, Alternator Mount Quad Leg, New / Reman. New.

Genuine Alternator 12V 100A Mitsubishi. Part number P51X18300B 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 Quad 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 P51X18300B, 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.

For a alternator in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 and output 100 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Please confirm fitment by matching part number P51X18300B, the 12V 100A specification, and the mounting and pulley details against the existing alternator and vehicle application before ordering.

FAQ

What is the part number for this alternator?

The listed part number is P51X18300B. For this listing, part number P51X18300B is the main reference point. Listed voltage is 12. Listed output rating is 100. Published fitment references include MAZDA CX-3, MAZDA CX-3 2018, MAZDA CX-3 2019. These details should still be checked against the original unit before ordering.

Is this alternator new or remanufactured?

It is listed as new. For this listing, part number P51X18300B is the main reference point. Listed voltage is 12. Listed output rating is 100. Published fitment references include MAZDA CX-3, MAZDA CX-3 2018, MAZDA CX-3 2019. These details should still be checked against the original unit before ordering.

What voltage and output does it have?

It is a 12V alternator with a 100A power rating. For this listing, part number P51X18300B is the main reference point. Listed voltage is 12. Listed output rating is 100. Published fitment references include MAZDA CX-3, MAZDA CX-3 2018, MAZDA CX-3 2019. These details should still be checked against the original unit before ordering.

What type of regulator does it use?

It has an internal regulator. For this listing, part number P51X18300B is the main reference point. Listed voltage is 12. Listed output rating is 100. Published fitment references include MAZDA CX-3, MAZDA CX-3 2018, MAZDA CX-3 2019. These details should still be checked against the original unit before ordering.

What pulley details are listed?

The pulley is listed as 6 groove with a 51mm outside diameter. For this listing, part number P51X18300B is the main reference point. Listed voltage is 12. Listed output rating is 100. Published fitment references include MAZDA CX-3, MAZDA CX-3 2018, MAZDA CX-3 2019. These details should still be checked against the original unit before ordering.

How should I confirm whether it suits my vehicle?

Check the part number first, then compare the 12V and 100A rating, the quad leg mount, the 10.5mm / M10x1.25 pivot hole diameter, and the 6 groove pulley against the unit currently fitted to the vehicle. For this listing, part number P51X18300B is the main reference point. Listed voltage is 12. Listed output rating is 100. Published fitment references include MAZDA CX-3, MAZDA CX-3 2018, MAZDA CX-3 2019. These details should still be checked against the original unit before ordering.