# 21644931 Wiring Harness | Genuine Volvo Penta Part

## 🔧 Product Description

Main engine wiring harness used in the cables-and-fuses system of Volvo Penta TAD1250-TAD1252VE industrial engines. The harness distributes ECU power, sensor signals, actuator commands and fused circuits through the original sealed connectors.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD1250VE
-   Volvo Penta TAD1251VE
-   Volvo Penta TAD1252VE
-   Volvo Penta TAD1250-52VE

-   **Engine Family:** TAD

## ⚙️ Key Features

-   Genuine Volvo Penta TAD12 engine harness
-   Current replacement for earlier harness 3883266
-   Factory connector keying and wire lengths
-   Used with engine-control, sensor and fuse circuits
-   Marine/industrial sealed loom construction
-   Engine type: 12.1-litre inline-six electronically controlled industrial diesel

## 🔌 Function

Carries power, ground and control signals between the ECU, sensors, actuators, relays and engine interface.

## ⚠️ Common Signs of Failure

-   Multiple unrelated sensor fault codes
-   Loss of ECU communication
-   Chafed loom or broken conductors
-   Voltage drop under load

## 🛠️ 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

-   21644931 → Supersedes 3883266 → Supersedes 3841518 → Supersedes 3817866

### OEM / Related Numbers

-   3883266 earlier number superseded by this part
-   3841518 earlier number superseded by this part
-   3817866 earlier number superseded by this part

### Other-Brand OEM Numbers

-   VOE21644931
-   VOE3883266

## 📦 Condition

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

## Details

- **Price:** 4376.43 AUD
- **Vendor:** Volvo Penta
- **Type:** Electrical & Wiring
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 4376.43 AUD | In stock |

## Images

- 21644931 Wiring Harness | Genuine Volvo Penta Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21644931-wiring-harness-genuine-volvo-penta)
> Updated: 2026-10-10