22929188 Diode Unit | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta diode unit from the Alternator, Charging, Electric Motor and Electric Drives group, weighing 0.036 kg and listed for 31 D series applications. It supersedes part number 21216813.

🚤 Compatibility

• Engine Family: D

Full model list at the end of this description.

⚙️ Key Features

• Diode unit from the Alternator, Charging, Electric Motor and Electric Drives group
• 0.036 kg
• Listed for 31 D series applications
• Supersedes part number 21216813

🔌 Function

Rectifies the alternator's alternating output into direct current for the batteries and lets current pass in one direction only, so the batteries cannot discharge back through the windings.

⚠️ Common Signs of Failure

• Battery flat or undercharged despite the engine running
• Charge warning light glowing dimly or flickering
• Charging voltage low, unstable or ripple-heavy on a meter
• Radio interference or a whine through the electrics
• Diodes found blackened, cracked or open circuit on test

🛠️ Service Notes

• Check the battery, main cables and earth straps before condemning the diode unit, as a bad connection gives the same reading
• Disconnect the batteries before working on the charging circuit, and never break the alternator output while the engine runs

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 22929188 → Supersedes 21216813

OEM / Related Numbers

• 21216813 earlier number superseded by this part

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D13C3-B MH, D13C1-B MH, D13C4-B MH, D13C2-B MP, D13C4-B MP, D13C5-B MP, D13C6-A MP, D13C7-B MP, D13C8-B MP, D13B-N MH, D13C1-A MH
• Volvo Penta D16C1-E MG, D16C1-F MG, D16C2-E MG, D16C2-F MG, D16C1-E MH, D16C1-F MH, D16C2-E MH, D16C2-F MH
• Volvo Penta D8A5-A MH, D8A6-A MH, D8A5-A MG, D8A6-A MG, D8A1-A MP, D8A2-A MP, D8A3-A MP, D8A4-A MP
• Volvo Penta D11C1-A MP, D11C3-A MP, D11C2-A MP, D11C4-A MP