Aftermarket Denso Voltage Regulator IN451

Vehicle Application

Isuzu Medium/Heavy Truck
FRR L6 7.8L 475cid Isuzu 6HK1 2000-2004
FSR L6 7.8L 475cid Isuzu 6HK1 1998-2002
FTR L6 7.8L 475cid Isuzu 6HK1 1998-2003
FVR L6 7.8L 475cid Isuzu 6HK1 1998-2003

Premier Windrower
2952i 2003-2009
4952i 2003-2009
8152i 2003-2009

Case Crawler Dozer
650L Case 4.5L 2009-2015
750L Case 4.5L 2008-2015
850L Case 6.7L 2008-2015

Case Lift Truck
586G Series III Case 4.5L 2004-2014

Case Loader
570MXT Series III 390 Diesel 2008-2015
580 Super M Series II 445T/M2 Case IH Dsl. 2001-2007
580M Series II Case 445T/M2 2004-2014
580M Series III Case 445T/M3 2008-2015
580SM Plus Series II 445T/M2 Case IH Dsl. 2004-2014
580SM Plus Series III Case 445TA/E3 2008-2015
580SM Series II Case 445T/M2 Case IH Dsl. 2004-2014
580SM Series III Case 445TA/E3 2008-2015
590SM Plus Series III Case 445TA/E3 2008-2015
590SM Series II Case 4.5L 2004-2014

New Holland Industrial Backhoe
B110 FPT445TA, 4.5L New Holland Dsl. 2006-2015
B115 FPT445TA, 4.5L New Holland Dsl. 2006-2015
B95 FPT445TA, 4.5L New Holland Dsl. 2006-2015
B95LR FPT445TA, 4.5L New Holland Dsl. 2008-2015
B95TC FPT445TA, 4.5L New Holland Dsl. 2008

New Holland Industrial Loader
B110B FPT445TA/E3 (110HP) 2008-2015
B115B FPT445TA/E3 (110HP) 2008-2015
B90B FPT445TA/M3 (95HP) 2008-2015
B95B FPT445TA/E3 (97HP) 2008-2015
B95B LR FPT445TA, 4.5L New Holland Dsl. 2008-2015
B95B TC FPT445TA/E3 (97HP) 2008-2015

Tug Technologies Aircraft Support Load Lifting Equipment
MA-25 0000

Caterpillar Ag. & Ind. Track Tractor
D3G Cat. 3046, 5.0L Caterpillar Dsl. 2002-2006
D4G Cat. 3046, 5.0L Caterpillar Dsl. 2004-2006
D4G LGP Cat. 3046, 5.0L Caterpillar Dsl. 2002-2007
D4G XL Cat. 3046, 5.0L Caterpillar Dsl. 2002-2008
D5G Cat. 3046, 5.0L Caterpillar Dsl. 2002-2007
D5G LGP Cat. 3046, 5.0L Caterpillar Dsl. 2002-2007

Features & Benefits

• Precision aftermarket replacement part

• Regulates alternator output voltage

• Helps maintain proper battery charging

• Supports stable charging system performance

• Manufactured to match original specifications

• Designed for dependable long-term operation

• Ideal for alternator rebuilding and repair

• Cross-referenced to OEM and aftermarket part numbers

What Does a Voltage Regulator Do?

The voltage regulator controls the alternator's output by regulating current supplied to the rotor field winding. As electrical demand changes, the regulator continuously adjusts field current to maintain the proper charging voltage for the battery and the vehicle's electrical system.

A properly functioning voltage regulator helps prevent battery overcharging and undercharging while protecting sensitive electrical components from excessive voltage. Because charging system performance depends on the interaction between the regulator, rotor, stator, rectifier, and battery, replacing a faulty regulator is an important step in restoring alternator performance.

Common Signs Replacement Is Needed

Replace the voltage regulator if you notice:

• Battery overcharging

• Battery not charging

• Low charging voltage

• High charging voltage

• Battery warning light illuminated

• Intermittent charging problems

• Headlights that brighten or dim with engine speed

• Charging system failure during testing

• Voltage regulator failure discovered during alternator rebuilding

Installation Recommendations

Installation should be performed by a qualified technician or experienced alternator rebuilder. Before installing the new regulator, inspect the brushes, brush holder, slip rings, rotor, stator, rectifier, wiring, and electrical connections for signs of wear or damage.

Always verify connector configuration and mounting style before installation. After assembly, bench-test the alternator to confirm proper charging voltage and overall charging system performance.

While You're Rebuilding

Inspect other common wear components to help maximize charging system reliability:

• Bearings

• Brushes

• Brush Holder

• Slip Rings

• Rectifier

• Diodes

• Rotor

• Clutch Pulley

• Insulators

Why Buy From RC Auto Electric?

RC Auto Electric specializes in alternator and starter rebuilding components for professional rebuilders, repair shops, automotive technicians, and DIY enthusiasts. Our extensive catalog includes thousands of OEM and aftermarket electrical components backed by accurate cross-reference information to help simplify part identification and reduce ordering mistakes.

Disclaimer

Compatibility information is provided as a reference only. Manufacturing revisions, production changes, and previous rebuilding modifications may affect internal alternator components. Always compare the original part, connector configuration, mounting style, voltage specifications, cross-reference numbers, and product photographs before installation. If you are unsure about compatibility, contact RC Auto Electric before ordering.