Alternator - Marelli (12727 12739) fits Caterpillar 420D 420D 225-3144

Aftermarket Alternator for Select Caterpillar 420D Applications

This is an aftermarket replacement alternator identified by Marelli reference numbers 12727 and 12739. It is intended for charging-system service on compatible equipment, and it fits Caterpillar 420D applications associated with the 225-3144 reference number. Verify your original unit and machine details before ordering.

Product Details

• Product Type: Alternator
• Reference Numbers: Marelli 12727, 12739
• OEM Reference Number: 225-3144

Fitment & Compatibility

• fits Caterpillar 420D with OEM reference 225-3144
• fits Caterpillar 420D (repeat listing as supplied)

Frequently Asked Questions

Q: What do the Marelli numbers mean? A: The title supplies Marelli (12727 12739) as reference numbers for this alternator. They help identify the part, but they do not by themselves confirm interchangeability.

Q: How do I confirm this alternator fits? A: Check the complete machine model and the OEM reference number 225-3144 on your original alternator or parts listing before purchase.

This is an aftermarket replacement part. Confirm fitment before purchase.