Mitsubishi Alternator 12V 115A A3TR0091AMA

This Mitsubishi alternator is a new 12V, 115A rotating electrical unit, supplied as each and identified by part number A3TR0091AMA. It uses an internal regulator and a twin leg alternator mount, which are important details to check against the original unit before ordering.

The unit runs a 6 groove pulley with a 62mm outside diameter and clockwise rotation. A note is supplied that the pulley diameter is 62mm and it may need to fit the original pulley, so the pulley arrangement on the vehicle needs to be confirmed carefully before installation.

Mounting dimensions are listed at 103mm inside mounting legs, 199mm mount centre to centre, 13mm pivot hole diameter and 11mm adjusting hole diameter, with a 13.3mm mount hole diameter. These measurements matter just as much as voltage and amperage when matching an alternator to an existing application.

Key Features

• New alternator, not remanufactured
• 12V, 115A output
• Internal regulator
• 6 groove pulley, 62mm outside diameter
• Clockwise rotation
• Twin leg alternator mount

Specifications

• Brand: Mitsubishi
• Part No.: A3TR0091AMA
• Product type: Alternator
• Voltage: 12V
• Amperage: 115A
• Unit of measure: Each
• Rotation: CW
• Regulator type: Internal

Known application details

• Volvo Marine/Penta
• Volvo Marine/Penta D4
• Volvo Marine/Penta D4 2003
• Volvo Marine/Penta D6B
• Volvo Marine/Penta D6B 2003

Application and Buying Notes

Before buying, compare the part number A3TR0091AMA and the physical mounting measurements on the old alternator. The listed 103mm inside mounting legs, 199mm mount centre to centre, 13mm pivot hole diameter and 11mm adjusting hole diameter are the most practical checks when confirming a replacement.

The electrical rating is 12V and 115A, so this unit is suited to applications that require that exact output and voltage. If the original alternator differs in charging output, regulator style or rotation, the replacement should not be assumed to be interchangeable without checking the vehicle or marine application details.

Pulley detail is important here. This alternator has a 62mm, 6 groove pulley and the note advises it may need to fit the original pulley. That means the belt profile and pulley fit should be verified before purchase, especially where the existing pulley arrangement must be retained.

The supplied fitment references point to Volvo Marine/Penta D4 and D6B applications, including 2003 listings. Even with those references, the safest approach is to confirm the full application, mounting layout and part number against the original unit already fitted to the engine.

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 A3TR0091AMA 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 2 Years 400,000km, Inside Mounting Legs 103mm, Pivot Hole Diameter 13, Pulley Outside Diameter 62mm, Regulator Type Internal, Suits Unit Make Mitsubishi, Note Pulley diameter 62mm. May need to fit original pulley, Mount Cnt to Cnt 199mm.

Additional published details for cross-checking include Weight 5.9kg, Product Group 1 ROTATING ELECTRICAL, Part No. A3TR0091AMA, Brand MITSUBISHI, Description Mitsubishi Alternator 12V 115A, Adjusting Hole Diameter 11, Mount Hole Diameter 13.3, Power Rating (Amp) 115, Pulley Section 6 Groove, Rotation CW.

Mitsubishi Alternator 12V 115A. Part number A3TR0091AMA should be checked first. Listed voltage is 12. Listed output rating is 115. 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 A3TR0091AMA, 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 115 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm compatibility by checking part number A3TR0091AMA, 12V 115A output, internal regulator, CW rotation, 6 groove 62mm pulley, and the mounting measurements against the original alternator and application details before ordering.

FAQ

What is the part number for this alternator?

The part number listed is A3TR0091AMA. For this listing, part number A3TR0091AMA is the main reference point. Listed voltage is 12. Listed output rating is 115. Published fitment references include VOLVO MARINE/PENTA D4, VOLVO MARINE/PENTA D4 2003, VOLVO MARINE/PENTA D6B. 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 A3TR0091AMA is the main reference point. Listed voltage is 12. Listed output rating is 115. Published fitment references include VOLVO MARINE/PENTA D4, VOLVO MARINE/PENTA D4 2003, VOLVO MARINE/PENTA D6B. These details should still be checked against the original unit before ordering.

What voltage and amperage does it have?

It is a 12V alternator with a 115A power rating. For this listing, part number A3TR0091AMA is the main reference point. Listed voltage is 12. Listed output rating is 115. Published fitment references include VOLVO MARINE/PENTA D4, VOLVO MARINE/PENTA D4 2003, VOLVO MARINE/PENTA D6B. These details should still be checked against the original unit before ordering.

What pulley details are listed?

It has a 6 groove pulley with a 62mm outside diameter, and the note says it may need to fit the original pulley. For this listing, part number A3TR0091AMA is the main reference point. Listed voltage is 12. Listed output rating is 115. Published fitment references include VOLVO MARINE/PENTA D4, VOLVO MARINE/PENTA D4 2003, VOLVO MARINE/PENTA D6B. These details should still be checked against the original unit before ordering.

What mounting measurements should be checked?

The key mounting details listed are 103mm inside mounting legs, 199mm mount centre to centre, 13mm pivot hole diameter, 11mm adjusting hole diameter and 13.3mm mount hole diameter. For this listing, part number A3TR0091AMA is the main reference point. Listed voltage is 12. Listed output rating is 115. Published fitment references include VOLVO MARINE/PENTA D4, VOLVO MARINE/PENTA D4 2003, VOLVO MARINE/PENTA D6B. These details should still be checked against the original unit before ordering.

Which applications are referenced?

The fitment references supplied are Volvo Marine/Penta, Volvo Marine/Penta D4, Volvo Marine/Penta D4 2003, Volvo Marine/Penta D6B and Volvo Marine/Penta D6B 2003. These should still be checked against the original unit and application details before purchase. For this listing, part number A3TR0091AMA is the main reference point. Listed voltage is 12. Listed output rating is 115. Published fitment references include VOLVO MARINE/PENTA D4, VOLVO MARINE/PENTA D4 2003, VOLVO MARINE/PENTA D6B. These details should still be checked against the original unit before ordering.