21299440 Voltage Regulator | Genuine Volvo Penta Part

🔧 Product Description

An electronic voltage regulator used with selected 28-volt, 55-amp Volvo Penta alternator systems. It replaces earlier regulator 20799383 in the applicable installation.

🚤 Compatibility

Typically suits:

• Volvo Penta D5A-B TA
• Volvo Penta D5A-T
• Volvo Penta D5A-TA
• Volvo Penta D7A-B TA
• Volvo Penta D7A-T
• Volvo Penta D7A-TA
• Volvo Penta D7C-B TA
• Volvo Penta D7C-TA
• Volvo Penta MD2010
• Volvo Penta MD2010B

• Engine Family: D, MD

⚙️ Key Features

• Designed for 28 V, 55 A charging systems
• Replaces 20799383
• Controls charging voltage and protects the battery system
• Engine type: Industrial diesel with approximately 28 V regulated output

🔌 Function

Controls alternator field current to maintain the specified charging voltage.

⚠️ Common Signs of Failure

• Battery does not charge
• Charging voltage is too high
• Battery warning lamp remains on
• Alternator output is intermittent
• Electrical equipment experiences overvoltage
• Regulator or alternator overheats

🛠️ 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

• 21299440 → Supersedes 20799383

OEM / Related Numbers

• 20799383 earlier number superseded by this part
• 20756555 - belt tensioner
• 20756597 - tension block
• 20460411 - alternator bracket

📦 Condition

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