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