# 20580794 Alternator | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta D5/D7 28V 140A Alternator - Part Number: 20580794

  

A genuine 28-volt, 140-amp alternator for compatible Volvo Penta D5/D7 industrial engines. It supersedes earlier alternator 20460893 and works with voltage regulator 20580795.

  

⚙️ Key Features

  

• 28-volt, 140-amp charging output

• Volvo Penta remanufactured alternative: 3803960

• Matched fan, pulley, Woodruff key and mounting arrangement for the documented installation

• Works with Volvo Penta voltage regulator 20580795

• High-output design supports engine controls, battery charging and auxiliary electrical loads

• Correct belt alignment and cable capacity are essential for full rated output

• Volvo Penta remanufactured alternative 3803960 is documented for the same assembly

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 20580794 - Current genuine Volvo Penta service reference

  

OEM / Related Numbers:

  

• 20580794 → Supersedes 20460893

• 3803960 - Volvo Penta remanufactured alternator

• 20409228 - Earlier alternator reference

• 20580795 - Matching voltage regulator

• 20580795 - Related D5/D7 Alternator Voltage Regulator

• 20580876 - Related Spacer

• 20580933 - Related Hose

• 20460893 - Earlier alternator reference

• 20460371 - Alternator fan

• 20460369 - Washer

• 20460368 - Nut

• 20460370 - Woodruff key

• 20460359 - Pulley

• 978774 - V-belt set

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Volvo Penta D7 industrial diesel engines

• TAD520/TAD720-series turbocharger, charging and flywheel installations

  

Typically suits:

  

• Engine models:

• TAD520VE

• TAD720VE

• TAD721VE

• TAD722VE

• TAD750VE

• TAD760VE

• Engine Type: Volvo Penta D7 inline-six industrial diesel

• HP Range: Determined by the exact D7 engine rating

• Electrical System: 28 volt

• Rated Output: 140 amp

  

• Year Range: Engine-generation and serial-number controlled

• Serial Applicability: Confirm the turbocharger, alternator, flywheel or belt configuration by engine serial number

  

🔌 Function

  

Generates regulated electrical power and recharges the battery while the engine runs.

  

Common signs of failure or reasons for replacement:

  

• Charging voltage does not rise correctly with the engine running

• Battery or low-voltage warnings occur

• Charging output becomes intermittent

• Bearing rumble, belt squeal or excessive pulley heat develops

• The alternator overheats or produces a burning smell

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 4747.67 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 4747.67 AUD | In stock |

## Images

- 20580794 Alternator | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20580794-alternator-genuine-volvo-penta)
> Updated: 2026-07-30