VolvoEngine Parts

3803940 — 12V 130A Alternator 3884858 3803940 3803577 For Volvo Penta Engine Ad31D Ad40B D41L-A Kamd42A Tamd41A Tmd31D Tmd41L-A

This 12V 130A alternator is responsible for generating electrical power to charge the battery and run the vehicle's electrical systems while the engine is running. It is built to provide a stable voltage output under varying engine speeds, unlike a worn alternator that may undercharge or overcharge the battery. Operators might observe dimming headlights, a battery warning light on the dashboard, or electrical system malfunctions if this alternator is not functioning correctly.

12V 130A Alternator 3884858 3803940 3803577 For Volvo Penta Engine Ad31D Ad40B D41L-A Kamd42A Tamd41A Tmd31D Tmd41L-A – Part No 3803940 – Volvo Spare Part
Part Specifications
BrandVolvo
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeAlternator
MaterialAluminum and copper
ApplicationEngine electrical charging system
Service LifeReplace as needed based on testing and inspection
Compatibility3884858, 3803577
ConditionNew — OEM specification aftermarket

Failure Symptoms

A common symptom of a failing alternator is a battery warning light illuminating on the dashboard, indicating insufficient charging. Headlights may appear dimmer than usual, or electrical accessories might function erratically. If the alternator fails completely, the battery will eventually discharge, leading to a complete loss of electrical power and engine shutdown.

Installation Tip

Always disconnect the battery before removing or installing the alternator to prevent electrical shorts. Ensure the drive belt is properly tensioned after installation to prevent slippage.

Service Note

Test the battery's condition and check the drive belt tension and condition when replacing the alternator.