# 3840309 Rectifier | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta rectifier for alternator 3803845, from the Alternator, Charging, Electric Motor, Electric Drives group, weighing 0.191 kg and listed for 36 applications on D series engines. It is specific to that alternator, so identify the alternator before ordering.

## 🚤 Compatibility

-   **Engine Family:** D

Full model list at the end of this description.

## ⚙️ Key Features

-   For alternator 3803845
-   0.191 kg
-   36 applications on D series engines
-   Serviceable item within the alternator

## 🔌 Function

Converts the alternator's alternating output into the direct current the batteries and boat systems need.

## ⚠️ Common Signs of Failure

-   No charge at all, or charge that collapses under load
-   Batteries flat despite the alternator turning and the belt being tight
-   Radio interference or a whine through the audio system
-   Diodes discoloured, cracked or burnt on inspection
-   Alternator running unusually hot

## 🛠️ Service Notes

-   Confirm the alternator is 3803845 before ordering this rectifier
-   Check the regulator, brushes and slip ring at the same time - one failure often follows another
-   Never disconnect a battery with the engine running, as the voltage spike can destroy a new rectifier

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D11C1-A MP, D11C3-A MP, D11C2-A MP, D11C4-A MP, D11B3-A MP, D11B4-A MP, D11A-A, D11A-B, D11A-C, D11A-D, D11A-E, D11B2-A MP, D11A-C MP, D11A-D MP, D11A-E MP, D11B1-A MP
-   Volvo Penta D9A2J, D9A2G, D9A2L MH, D9A2D, D9A2B, D9A2F, D9A2K, D9A2H, D9A2M MP, D9A2A, D9A2C, D9A2E
-   Volvo Penta D12D-B MP, D12D-D MP, D12D-G MP, D12D-H MP
-   Volvo Penta D8A5-A MH, D8A6-A MH, D8A3-A MP, D8A4-A MP

## Details

- **Price:** 876.68 AUD
- **Vendor:** Volvo Penta
- **Type:** Charging & Alternators
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 876.68 AUD | In stock |

## Images

- 3840309 Rectifier | Genuine Volvo Penta Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3840309-rectifier-genuine-volvo-penta)
> Updated: 2026-10-07