# 21187847 Wiring Harness | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine engine wiring harness for selected Volvo Penta 5.0-litre and 5.7-litre petrol marine engines. Part number 21187847 replaces earlier harness 3848901.

## ⚙️ Key Features

-   Current replacement for harness 3848901
-   Documented 5.0L and 5.7L petrol-engine application
-   Complete factory engine harness
-   Marine-sealed sensor and actuator connectors
-   Engine suffix and ECM version control fitment

## 🔌 Function

The harness distributes battery and ignition power and carries sensor, injector, ignition and control signals across the engine.

## ⚠️ Common Signs of Failure

-   Intermittent no-start
-   Multiple unrelated sensor or injector codes
-   Misfire caused by wiring faults
-   Chafed or heat-damaged conductors
-   Fault changes 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 Supersession Chain

-   21187847 → Supersedes 3848901

### OEM / Related Numbers

-   3848901 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 2332.0 AUD
- **Vendor:** Volvo Penta
- **Type:** Electrical & Wiring
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2332.00 AUD | In stock |

## Images

- 21187847 Wiring Harness | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21187847-wiring-harness-genuine-volvo-penta)
> Updated: 2026-10-21