Aftermarket Mitsubishi Voltage Regulator IM851HD

Specifications

• MFR: MITSUBISHI
• DIM 1: 24mm ID Slip Ring Cover
• FEATURE 1: 100% New Heavy Duty
• FEATURE 2: Soft start
• FEATURE 3: Lamp activated
• FEATURE 4: Short-circuit protection: lamp, field
• NOTE 1: With capacitor
• SPECS FOR: Mitsubishi IR/IF Alternators
• SPECS: 12 Volt, A-Circuit, IG-C-L-FR Terminals, 14.5 Vset

Used On

• Acura (2001-2005)
• Honda (2001-2006)

Replaces

Honda: 31150-PLC-004, 31150-PLM-A01, 31150-PNC-004
Mitsubishi: 487, 495, 4954726D, A866X48782
Original Reference Number: 495

Lester Numbers

13893, 13966

Unit Numbers

Acura: 31100-PLM-C01, 31100-PLM-C02, 31100-PNC-004, 31100-PND-004, 31100-PND-004RM, AFGA51, AHGA55, AHGA61
Bombardier / Can-Am / Sea Doo: 420685762, 420685763
Honda: 06311-PLM-505RM, 31100-PLM-A01, 31100-PLM-A02, 31100-PLM-A02RM, 31100-PNC-004, 31100-PND-004, 31100-PND-004RM, AHGA50, AHGA55, AHGA61, AHGA64
Kymco: 12R1538
Mitsubishi: A002TB7591, A002TB7591ZE, A002TC0691, A002TC0691A, A002TC0691ZE, A005TA6991A, A005TA7091, A005TA7091ZC, A005TA7191, A005TA7191ZC

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.