20460884 Voltage Regulator | Genuine Volvo Penta Part

🔧 Product Description

Alternator voltage regulator used with the original 28 V / 140 A alternator 20460893. This regulator is alternator-version specific and must not be selected solely from the engine model. Alternator voltage regulator used specifically with Volvo Penta 28 V / 140 A alternator 20460893. The later alternator 20580794 uses regulator 20580795, so the regulator must be selected by alternator version rather than engine model alone.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD720VE
• Volvo Penta TAD721VE
• Volvo Penta TAD722VE
• Volvo Penta TAD750VE
• Volvo Penta TAD520VE
• Volvo Penta TAD760VE

• Engine Family: TAD
• Year Range: Approximately late 1990s-2000s

⚙️ Key Features

• Controls alternator field current and charging-system output voltage
• Maintains stable battery charging under changing electrical load
• Matched to the specified alternator version rather than engine model alone
• Protects batteries and connected electrical equipment from abnormal system voltage
• Direct replacement for the catalogued regulator assembly
• Engine type: Volvo Penta 4- and 6-cylinder industrial diesel

🔌 Function

Monitors and controls alternator output to maintain the charging system near its specified voltage across engine speed and electrical load.

⚠️ Common Signs of Failure

• Battery voltage remains below charging specification with the engine running
• Overcharging, boiling batteries or unusually high system voltage
• Charging warning lamp remains illuminated or operates intermittently
• Flickering lamps, unstable instruments or voltage that changes sharply with engine speed
• Alternator output remains incorrect after battery, belt, wiring and ground checks

🛠️ Service Notes

• Isolate the batteries at the main switch and disconnect the negative lead before working on the charging circuit, and never disconnect a battery while the engine is running
• Rule out the simple causes before condemning a regulator — a slack or glazed drive belt, corroded or loose battery and alternator connections, a poor engine-to-battery earth, or a tired battery all produce the same symptoms
• Check the brushes and slip rings while the regulator is off; a worn brush set gives the same low or erratic output
• Fit clean and dry, seat any insulating washers and bushes in their original order so nothing bridges across them, and tighten the terminals firmly without crushing them
• Measure charging voltage at the battery with the engine running once the regulator is fitted, and compare it with the value specified for your engine and battery type

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20460884 (regulator for alternator 20460893)
• 20580795 (regulator used with later alternator 20580794; not interchangeable without confirming alternator version)

OEM / Related Numbers

• 20460893 original 28 V / 140 A alternator
• 20580795 regulator used with alternator 20580794
• 20494172 rectifier
• 20460856 capacitor
• 20460885 alternator gasket
• 20460886 carbon brush
• 20460438 retaining screws

Other-Brand OEM Numbers

• Bosch: 1197311316
• Bosch: 1987AN0215
• Bosch: 1197311315

OEM Reman Alternatives

• 3803960 exchange alternator based on 20460893

📦 Condition

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