Alternator Rectifier Lucas AS123 12V 115mm 6 Diode RCT4015

Vehicle Compatibility & OE Cross Reference

This Lucas AS123 style 12V alternator rectifier is designed for agricultural, industrial and 4×4 applications where the original rectifier matches the same 115 mm diameter, 6-diode layout and OE numbers listed below. It is commonly used on Case IH, Ford, JCB, Land Rover, Massey Ferguson, Renault and Rover applications.

OE Numbers by Brand

• Case IH: K262267
• Ford: E7NN-10304AA; E7NN10304AA
• JCB: 71410805
• Land Rover / Rover: BAU4920; BAU5266; BAU5813; RTC5045
• Massey Ferguson: 1897700M91; 3474648M91; 347468M91; 3477529M91
• Renault: 5430021884
• Cross reference (Mobiletron): RL-01H
• Other suppliers: RCT4015 and equivalent Lucas AS123 rectifier references

If your original rectifier carries any of these OE or comparison numbers and measures approximately 115 mm in outer diameter with 6 diodes, RCT4015 is a suitable replacement option for the matching Lucas AS123 alternator.

Specifications

• Reference: RCT4015
• Part type: Alternator rectifier
• Alternator family: Lucas AS123 type
• System voltage: 12V
• Outer diameter: 115 mm
• Number of diodes: 6
• Current capacity: from 35 A
• OE coverage: Case IH, Ford, JCB, Land Rover, Massey Ferguson, Renault, Rover (as per OE list)
• Comparison number: Mobiletron RL-01H
• Function: Rectifies alternator AC output to DC to charge the battery and supply the electrical system

Features

• Rectifier 12V 115 mm 6 diode design for Lucas AS123 style alternators
• From 35 A current rating for reliable charging on agricultural and industrial engines
• Wide OE cross reference covering Case IH, Ford, JCB, Land Rover, Massey Ferguson, Renault and Rover
• Direct replacement footprint to simplify alternator overhaul and in-field repairs
• Helps restore proper charging performance where the original rectifier has failed, shorted or gone open circuit

Why Buy From Us

• Local stock on key Lucas AS123 rectifiers like RCT4015 to minimise downtime
• Standard 12 month warranty under normal operating and installation conditions
• Fitment assistance using OE numbers, alternator labels and photos
• Secure online ordering with reliable nationwide courier delivery
• Trusted by workshops, farmers and fleet operators for durable charging system components

Installation & Maintenance Tips

• Disconnect the battery before removing the alternator or working on the rectifier.
• Confirm alternator model, OE number and rectifier diameter (115 mm) before fitting RCT4015.
• Inspect stator windings, slip rings and brushes for heat damage or short circuits when replacing a failed rectifier.
• Ensure all main power and earth connections are clean and tight to prevent voltage drop and repeat failures.
• After reassembly, bench test the alternator or check charging voltage on the vehicle to confirm correct operation.
• If you are unsure about alternator repairs, have the rectifier fitted and tested by a qualified auto electrician.