21512120 Wiring Harness | Genuine Volvo Penta Part

🔧 Product Description

A genuine engine-mounted wiring harness used on Volvo Penta 5.0L and 5.7L V8 petrol sterndrive packages. It carries power, ground and control signals between the engine control module, ignition system, fuel-injection components, sensors, relays and the boat-side electrical connection. The factory branch lengths, connector keying and protective covering are matched to the specified Gi and GXi engine variants.

🚤 Compatibility

Typically suits:

• Volvo Penta V8-300-E-A
• Volvo Penta V8-300-CE-A
• Volvo Penta V8-320-E-A
• Volvo Penta V8-320-CE-A
• Volvo Penta 5.7GXiE-320-R
• Volvo Penta 5.7GXiCE-320-R
• Volvo Penta 5.7GXiCE-P
• Volvo Penta 5.7GXiE-P
• Volvo Penta 5.7GiE-300-P
• Volvo Penta 5.7GiE-300-R
• Volvo Penta 5.7GiCE-300-P
• Volvo Penta 5.7GiCE-300-R
• Volvo Penta 5.0GiCE-225-S
• Volvo Penta 5.0GXiCE-P
• Volvo Penta 5.0GXiE-270-R
• Volvo Penta 5.0GXiCE-270-R
• Volvo Penta 5.0GXiE-P
• Volvo Penta V8-225-CE-A
• Volvo Penta V8-270-E-A
• Volvo Penta V8-270-CE-A

• Engine Family: V
• HP Range: 225-320 HP
• Year Range: Approximately 2012 - 2016 production-era applications

⚙️ Key Features

• Genuine Volvo Penta engine harness for electronic-fuel-injected V8 petrol engines
• Factory connector types and branch lengths for correct routing around the engine
• Supports engine-management, ignition, fuel-injection and sensor circuits
• Designed for the specified P-, R- and S-suffix emissions and installation variants
• Direct replacement for a damaged, corroded or internally open original harness
• Engine type: GM-based 5.0L and 5.7L V8 multi-port fuel-injected petrol marine engines

🔌 Function

Distributes electrical power and low-voltage control signals between the engine control module and the engine-mounted electrical components. Correct conductor resistance, shielding, grounding and connector retention are essential for reliable starting, charging, ignition and fuel-injection operation.

⚠️ Common Signs of Failure

• Intermittent no-start, stalling or engine shutdown
• Several unrelated sensor or actuator fault codes appearing together
• Misfire, unstable idle or loss of power caused by poor electrical continuity
• Corrosion, moisture or heat damage inside connectors
• Chafed insulation, broken conductors or 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 / Related Numbers

• 40869143 - 5.7GXiCE-P engine product reference
• 40869139 - 5.0GXiCE-P engine product reference
• 40869297 - 5.7GXiE-P engine product reference
• 40869295 - 5.0GXiE-P engine product reference
• 40869385 - 5.0GiCE-225-S engine product reference
• 40869141 - 5.7GiCE-300-P engine product reference
• 40869325 - 5.0GXiCE-270-R engine product reference
• 40869329 - 5.7GXiCE-320-R engine product reference

📦 Condition

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