Genuine Alternator 12V 120A Denso Part No. 3M5T10300LD

This Genuine Products alternator is a 12V, 120A unit with part number 3M5T10300LD and it suits a Denso application. It sits in the rotating electrical category and is sold as a single each item, which makes it a straightforward replacement option when the original unit has the same identifiers.

As an OE manufacturer and supplier for many euro vehicles, the unit is presented as being built to factory-style expectations rather than as a generic aftermarket substitute. The listed testing includes current and voltage measurements, load and cycling tests for 1,000 hours, plus salt, thermal and vibration destruction testing, all of which are relevant when comparing electrical durability and build consistency.

The key identifiers to check before ordering are the 12V voltage rating, 120A power rating, Denso unit make, and part number 3M5T10300LD. Matching those details is the most reliable way to confirm you are looking at the correct alternator for your application.

Key Features

• Genuine Products alternator
• 12V system voltage
• 120A power rating
• Suits Denso unit make
• Part number 3M5T10300LD
• One year warranty

Specifications

• Product type: Alternator
• Brand: Genuine Products
• Voltage: 12V
• Power rating: 120A
• Unit make: Denso
• Part number: 3M5T10300LD
• Unit of measure: Each
• Warranty: One year

Application and Buying Notes

When comparing this alternator with your existing unit, the most useful checkpoints are the 12V rating, 120A output, Denso unit make, and part number 3M5T10300LD. If any of those details differ from the unit being replaced, pause before ordering and confirm the application with your vehicle information and the old part in hand.

Alternators are not a one-spec-fits-all component, even when the voltage and amperage appear close. The 120A rating tells you the output level, but the mounting, plug style, pulley arrangement, and physical dimensions still need to match the vehicle application. Those details are not listed here, so part-number confirmation remains the safest buying step.

This unit is described as an OE-style alternator for many euro vehicles, which is helpful context, but it is still important to verify the exact fit against 3M5T10300LD rather than relying on the description alone. Using the part number, the Denso make, and the 12V/120A specification together will give you a much stronger match check than vehicle family assumptions.

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 3M5T10300LD 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, Suits Unit Make Denso, Product Group 2 ALTERNATORS, Part No. 3M5T10300LD, Brand GENUINE PRODUCTS, Description Genuine Alternator 12V 120A Denso, Power Rating (Amp) 120.

Additional published details for cross-checking include Voltage 12, Product Group 1 ROTATING ELECTRICAL.

Genuine Alternator 12V 120A Denso. Part number 3M5T10300LD should be checked first. Listed voltage is 12. Listed output rating is 120. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number 3M5T10300LD, 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 120 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Where no verified application list is available, the part number, mounting details, connector style, and published specifications should be used as the primary selection criteria.

In the absence of a verified fitment list, the safest approach is to compare the removed unit directly with the listed product details. That includes checking the housing style, pulley layout, regulator arrangement, and any visible identification numbers before supply is approved.

Compatibility note: Please confirm compatibility using the part number 3M5T10300LD, the Denso unit make, and the 12V 120A specification before purchasing. If your replacement alternator does not match those details, do not assume it will fit.

FAQ

What type of part is this?

It is an alternator from Genuine Products, listed under rotating electrical and alternators. For this listing, part number 3M5T10300LD is the main reference point. Listed voltage is 12. Listed output rating is 120. These details should still be checked against the original unit before ordering.

What are the electrical specifications?

The alternator is 12V with a 120A power rating. For this listing, part number 3M5T10300LD is the main reference point. Listed voltage is 12. Listed output rating is 120. These details should still be checked against the original unit before ordering.

What part number should I match?

The listed part number is 3M5T10300LD. For this listing, part number 3M5T10300LD is the main reference point. Listed voltage is 12. Listed output rating is 120. These details should still be checked against the original unit before ordering.

What unit make does it suit?

It suits a Denso unit make. For this listing, part number 3M5T10300LD is the main reference point. Listed voltage is 12. Listed output rating is 120. These details should still be checked against the original unit before ordering.

Is there a warranty listed?

Yes, the listed warranty is one year. For this listing, part number 3M5T10300LD is the main reference point. Listed voltage is 12. Listed output rating is 120. These details should still be checked against the original unit before ordering.

How should I check fitment before ordering?

Match the part number 3M5T10300LD, the Denso unit make, and the 12V 120A specification against your existing alternator and vehicle application details. For this listing, part number 3M5T10300LD is the main reference point. Listed voltage is 12. Listed output rating is 120. These details should still be checked against the original unit before ordering.