21297361 Wiring Harness | Genuine Volvo Penta Part

🔧 Product Description

A complete pre-terminated engine harness used to connect sensors, relays, injectors and the control module on selected 4.3-litre EFI marine petrol engines.

🚤 Compatibility

Typically suits:

• Volvo Penta 4.3GXiE-225-R
• Volvo Penta 4.3GXiE-M
• Volvo Penta 4.3GXiE-P
• Volvo Penta 4.3GXiE-Q

• HP Range: Approximately 225 HP

⚙️ Key Features

• Factory-terminated sensor and control branches
• Designed for the 4.3GXiE electrical system
• Sealed connectors for marine engine-compartment service
• Engine type: 4.3-litre V6 EFI marine petrol

🔌 Function

Carries power and control signals between the engine control module and the connected sensors, injectors and relays.

⚠️ Common Signs of Failure

• Intermittent misfire or shutdown
• Multiple sensor or injector fault codes
• Corroded connectors
• Broken conductors near harness branches
• Heat-damaged insulation

🛠️ 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

• 21297333 - wiring and relay bracket
• 3858809 - relay
• 3841369, 3841370, 3841371 and 3841373 - fuses
• 3840402 - mounting base

📦 Condition

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