21187847 Wiring Harness | Genuine Volvo Penta Part

🔧 Product Description

Genuine engine wiring harness for selected Volvo Penta 5.0-litre and 5.7-litre petrol marine engines. Part number 21187847 replaces earlier harness 3848901.

⚙️ Key Features

• Current replacement for harness 3848901
• Documented 5.0L and 5.7L petrol-engine application
• Complete factory engine harness
• Marine-sealed sensor and actuator connectors
• Engine suffix and ECM version control fitment

🔌 Function

The harness distributes battery and ignition power and carries sensor, injector, ignition and control signals across the engine.

⚠️ Common Signs of Failure

• Intermittent no-start
• Multiple unrelated sensor or injector codes
• Misfire caused by wiring faults
• Chafed or heat-damaged conductors
• Fault changes 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 Supersession Chain

• 21187847 → Supersedes 3848901

OEM / Related Numbers

• 3848901 earlier number superseded by this part

📦 Condition

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