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• 3883266 earlier number superseded by this part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