# 21512118 Wiring Harness | Genuine Volvo Penta Part

## 🔧 Product Description

A complete factory-terminated engine wiring harness used in the assigned Volvo Penta electronic engine-control system.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta V8-300-A
-   Volvo Penta V8-300-C-A
-   Volvo Penta V8-320-A
-   Volvo Penta V8-320-C-A
-   Volvo Penta 5.7GXi-320-R
-   Volvo Penta 5.7GXiC-320-R
-   Volvo Penta 5.7GXiC-P
-   Volvo Penta 5.7GXi-P
-   Volvo Penta 5.7Gi-300-P
-   Volvo Penta 5.7Gi-300-R
-   Volvo Penta 5.7GiC-300-P
-   Volvo Penta 5.7GiC-300-R
-   Volvo Penta 5.0GiC-225-S
-   Volvo Penta 5.0GXiC-P
-   Volvo Penta 5.0GXi-270-R
-   Volvo Penta 5.0GXiC-270-R
-   Volvo Penta 5.0GXi-P
-   Volvo Penta V8-225-C-A
-   Volvo Penta V8-270-A
-   Volvo Penta V8-270-C-A

-   **Engine Family:** V
-   **HP Range:** 225-320 HP

## ⚙️ Key Features

-   OEM connector and pin allocation
-   Engine-room-rated cable insulation
-   Protected branch routing
-   Connects sensors, actuators, power supplies and control modules
-   Configuration must match the engine and control-system generation

## 🔌 Function

The harness distributes electrical power and communication signals between the engine sensors, actuators, control unit and external interface.

## ⚠️ Common Signs of Failure

-   Multiple intermittent fault codes
-   No-start or engine shutdown
-   Sensor readings changing when the harness is moved
-   Chafed, oil-soaked or heat-damaged insulation
-   Corroded or pushed-back connector pins

## 🛠️ 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

-   20556333 - Related Volvo Penta harness references
-   20585153 - Related Volvo Penta harness references
-   21187851 - Related Volvo Penta harness references
-   21271237 - Related Volvo Penta harness references
-   21273758 - Related Volvo Penta harness references

## 📦 Condition

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

## Details

- **Price:** 3423.06 AUD
- **Vendor:** Volvo Penta
- **Type:** Electrical & Wiring
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 3423.06 AUD | In stock |

## Images

- 21512118 Wiring Harness | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21512118-wiring-harness-genuine-volvo-penta)
> Updated: 2026-10-12