# 21138339 Wiring Harness | Genuine Volvo Penta Part

## 🔧 Product Description

Brand-new genuine Volvo Penta main engine wiring harness for A-generation D6 marine diesels. The loom connects the EDC control system to the engine sensors, actuators, fuel-system components and vessel interface through the original sealed 89-pole and 36-pole connector architecture.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D6-330D-B
-   Volvo Penta D6-370D-A
-   Volvo Penta D6-310I-B
-   Volvo Penta D6-280I-B
-   Volvo Penta D6-280I-A
-   Volvo Penta D6-310I-A
-   Volvo Penta D6-310D-B
-   Volvo Penta D6-370I-A
-   Volvo Penta D6-370I-B
-   Volvo Penta D6-330I-B
-   Volvo Penta D6-310A-B
-   Volvo Penta D6-310A-A
-   Volvo Penta D6-280A-A
-   Volvo Penta D6-280A-B
-   Volvo Penta D6-330A-B

-   **Engine Family:** D
-   **HP Range:** 280-370 HP

## ⚙️ Key Features

-   Main D6-A engine loom with factory branch lengths
-   Sealed 89-pole and 36-pole control-system connections
-   Dedicated branches for water-in-fuel, fuel-pump, oil-level, pressure and temperature circuits
-   Marine-grade terminals and abrasion-resistant loom protection
-   Harness configuration must match the original D6-A electrical schematic
-   Engine type: Volvo Penta D6 inline six-cylinder common-rail marine diesel

## 🔌 Function

Distributes ECU power, grounds and signal circuits between the engine control unit, sensors, actuators and vessel-side harness.

## ⚠️ Common Signs of Failure

-   Intermittent or multiple unrelated diagnostic codes
-   No-start or shutdown caused by lost ECU power or ground
-   Corroded, pushed-back or overheated connector terminals
-   Chafed loom near brackets or hot components
-   Sensor readings changing when the harness is moved

## 🛠️ Service Notes

-   Compare the new harness with the old one before fitting — check the connector types, the number of pins and the branch lengths, and lay it out alongside the old loom to confirm every branch reaches its component
-   Disconnect the batteries before unplugging or fitting a harness, and support the loom as you work so its weight never hangs on a connector or a bulkhead grommet
-   Route it along the original path and secure it with the original clips and ties, clear of hot exhaust surfaces, sharp edges and anything that moves; leave a service loop at each connector rather than pulling a branch tight
-   Push every connector home until the lock latches and protect the joints with a marine dielectric grease — an intermittent electrical fault is far more often a partly seated or salt-corroded pin than a broken wire
-   Renewing the harness is the right repair where insulation is chafed, brittle or oil-soaked, or where corrosion has tracked inside the connector bodies; patch repairs in a damp engine bay tend to fail again, and any single conductor that is repaired should be joined with tinned marine cable of the same gauge, a proper crimp and adhesive-lined heat-shrink

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   Companion/alternate harness 21138341
-   Engine-side harness references 3809877, 21163206 and 21736443 are separate configuration parts

### Other-Brand OEM Numbers

-   VOE21138339

## 📦 Condition

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

## Details

- **Price:** 2061.85 AUD
- **Vendor:** Volvo Penta
- **Type:** Electrical & Wiring
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2061.85 AUD | In stock |

## Images

- 21138339 Wiring Harness | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21138339-wiring-harness-genuine-volvo-penta)
> Updated: 2026-09-06