21758827 Cable Kit | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta electrical bonding kit used on selected later-production D4 and D6 common-rail marine engines. The kit provides a low-resistance earth path between the alternator and engine structure, helping stabilise charging voltage and protect the EVC and engine-management circuits from poor grounding.

🚤 Compatibility

• Engine Family: D
• HP Range: 180-435 HP
• Year Range: Approximately 2010s

Full model list at the end of this description.

⚙️ Key Features

• Genuine alternator bonding-cable service package
• Matched cable length and terminal orientation for the engine installation
• Includes the specified toothed washer and flange screw
• Helps prevent voltage drop, erratic charging and electronic faults
• Designed for the applicable later D4/D6 electrical arrangement
• Engine type: Volvo Penta inline 4-cylinder and inline 6-cylinder common-rail marine diesel

📋 Kit Contents

• Bonding cable assembly - Volvo Penta 21758821
• Toothed lock washer - Volvo Penta 942767
• Flange screw - Volvo Penta 984734

🔌 Function

The cable provides a dedicated electrical return path from the alternator to the engine, reducing resistance and ensuring the charging and EVC systems share a stable ground reference.

⚠️ Common Signs of Failure

• Charging voltage is low or unstable
• Alternator or EVC faults appear intermittently
• Cable terminals become hot or discoloured
• Green corrosion develops beneath the insulation or terminals
• Continuity testing shows excessive resistance between alternator and engine ground

🛠️ Service Notes

• Isolate the batteries first, and lay the new cables alongside the old to confirm lengths and routing before anything is cut, clipped or connected
• Keep to the original route and support intervals, well clear of hot surfaces, sharp edges and moving parts, with grommets or sleeving wherever the run passes through a panel or bracket
• Clean every terminal and earth face to bright metal and tighten to the specified figure, then protect the joint — a poor earth shows up later as a dozen unrelated electrical faults
• Fit the kit complete, including its fuses, holders, boots, seals and ties; those protective parts are what make it a marine installation rather than just wire
• Leave a little slack across flexible mountings, reconnect the batteries last, and check the affected circuits through before closing everything up

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21758821 - included bonding cable
• 942767 - included toothed washer
• 984734 - included flange screw

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D6-330A-F, D6-370A-F, D6-330D-F, D6-370D-F, D6-300A-F, D6-300D-F, D6-300I-F, D6-330I-F, D6-370I-F, D6-435D-F, D6-400A-F, D6-435I-F
• Volvo Penta D4-260A-F, D4-260D-F, D4-260I-F, D4-300A-F, D4-300D-F, D4-180I-F, D4-225I-F, D4-300I-F, D4-225A-F