21586874 Wiring Harness | Genuine Volvo Penta Part

🔧 Product Description

Factory wiring harness for Volvo Penta D4 and D6 diesel installations using the specified drive/EVC configuration. The loom retains the original connectors, branch geometry and circuit allocation needed for reliable power and signal transfer.

🚤 Compatibility

Typically suits:

• Volvo Penta D6-330D-E
• Volvo Penta D6-370D-E
• Volvo Penta D4-260D-E
• Volvo Penta D4-260D-F
• Volvo Penta D4-300D-E
• Volvo Penta D4-300D-F
• Volvo Penta D6-330D-F
• Volvo Penta D6-370D-F
• Volvo Penta D6-300D-F
• Volvo Penta D6-310D-E
• Volvo Penta 8.1IPSCE-Q
• Volvo Penta D6-435D-E
• Volvo Penta D6-435D-F
• Volvo Penta IPS-F

• Engine Family: D, IPS
• HP Range: 260-435 HP

⚙️ Key Features

• Genuine Volvo Penta D4/D6 wiring harness
• OEM connector keying and terminal arrangement
• Correct branch lengths for the listed D4 and D6 configurations
• Supports EVC, sensor and actuator circuits
• Direct replacement only where part number 21586874 is specified
• Engine type: Volvo Penta D4 and D6 electronically controlled diesel marine engines

🔌 Function

Links the specified D4/D6 engine and drive-control components to the original EVC power, sensor and communication circuits.

⚠️ Common Signs of Failure

• EVC alarms or intermittent communication
• No power at a connected sensor, actuator or module
• Intermittent starting, shift or throttle response
• Corrosion, fretting or heat damage at terminals
• Continuity faults caused by chafed or broken conductors

🛠️ 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

📦 Condition

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