21173893 Alternator Kit | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta alternator kit rated 24 V and 80 A for D9 and D11 marine engines, weighing 14.855 kg and listed for 32 applications across the D11, D9 and D8 ranges. The accessories catalogue lists it among the alternator kits that include the alternator, so it adds a complete second charging source rather than mounting hardware alone. The 12 V, 115 A kit for the same engines is 21173894.

🚤 Compatibility

• Engine Family: D
• HP Range: Approximately 755 HP
• Year Range: Approximately 2004 onward

Full model list at the end of this description.

⚙️ Key Features

• 24 V, 80 A output
• For D9 and D11 marine engines
• Listed as an alternator kit including the alternator
• 14.855 kg
• 12 V, 115 A equivalent is 21173894
• Supplied complete with the alternator
• Capacity: 24V/80A
• Fits: D9, D11

📋 Kit Contents

• 1 x 24-volt 80-amp alternator - supplied within kit 21173893
• 1 x engine-specific alternator mounting-bracket package - kit-only component numbers are not fully published
• 1 x belt / tensioning and pulley connection package as required by the engine installation - kit-only component numbers are not fully published
• 1 x electrical connection and mounting-hardware package - supplied under kit 21173893

🔌 Function

Converts engine-driven rotation into 24 V electrical power for charging an auxiliary battery bank and supplying vessel loads.

⚠️ Common Signs of Failure

• Charging voltage or current below specification
• Battery warning or low-voltage alarms staying active
• Alternator, belt or bracket running out of alignment
• Bearing noise, overheating or a burning smell
• Chafed cable insulation or damaged terminals at the alternator

🛠️ Service Notes

• This is the 24 V kit and 21173894 is the 12 V one, so match the vessel's system voltage
• It is nearly three times the weight of the 12 V kit, so allow for the extra mass on the engine bracketry
• Set belt alignment and tension after fitting, and re-check once the belt has bedded in

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21173893 → Supersedes 3812705

OEM / Related Numbers

• 3812704 earlier number superseded by this part
• 3812705 earlier number superseded by this part

Other-Brand OEM Numbers

• Bosch, Prestolite and Balmar 24-volt high-output alternators are functional alternatives only after pulley, mounting, rotation, regulator and output-cable verification

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D11C1-A MP, D11C3-A MP, D11C2-A MP, D11C4-A MP, D11B3-A MP, D11B4-A MP, D11A-A, D11A-B, D11A-C, D11A-D, D11A-E, D11B2-A MP, D11A-C MP, D11A-D MP, D11A-E MP, D11B1-A MP
• Volvo Penta D9A2J, D9A2G, D9A2L MH, D9A2D, D9A2B, D9A2F, D9A2K, D9A2H, D9A2M MP, D9A2A, D9A2C, D9A2E
• Volvo Penta D8A5-A MH, D8A6-A MH, D8A3-A MP, D8A4-A MP