High Output Alternator for MG MGB Midget (1974-1979) 1.3L 1.5L 1.8L

High-Output 95-Amp Alternator for 1974-1979 MG MGB, Midget (GHN5, GAN5, GAN6)

What it Does: The 95-amp high-output alternator replaces the low-output factory Lucas charging unit on 1974-1979 MG MGB and Midget sports cars to eliminate voltage drops, stabilize electrical system operation, and reliably power modern auxiliary accessories.

The Stock MG MGB, Midget Lucas Charging Dilemma

Factory 1970s British Leyland vehicles relied on Lucas 16ACR, 17ACR, and 18ACR alternators rated at a meager 34 to 43 amps. These legacy charging systems produce minimal current at engine idle speeds, often dropping system voltage below 12.6V under baseline electrical loads. Operating with modern halogen headlights, electric cooling fans, or high-draw ignition upgrades quickly overwhelms the stock rectifier diodes, resulting in persistent battery drain, heat-induced diode plate failure, dim instrumentation, and intermittent ignition coil misfires under load.

The Engineering Solution

This upgraded 95-amp unit engineered for the GHN5, GAN5, and GAN6 platforms delivers more than double the amperage of the original Lucas equipment while maintaining an authentic exterior profile. Fabricated with heavy-gauge high-temperature copper stator windings and an internally balanced high-speed rotor, this alternator ensures uninterrupted 13.5V to 14.5V output even at hot idle. Premium sealed rotor bearings prevent radial play and belt deflection issues, while a heavy-duty internal solid-state voltage regulator protects your electrical harness from damaging voltage spikes. Designed as a true bolt-on unit, it preserves OE mounting ear spacing, pulley offset, and Lucas-style 3-pin connector orientation for seamless harness integration.

What's Included

• 1 High Output 95-Amp Alternator (Part Number 14029)

Technical Specifications

Compatibility

• 1974 MG MGB 1.8L (BMC B-Series 18V)
• 1974 MG Midget 1.3L (BMC A-Series 1275cc)
• 1975-1979 MG Midget 1.5L (Triumph Standard SC 1493cc)

Frequently Asked Questions & Fitment Warnings

Does this fit the GHN5 and GAN5/GAN6 MG MGB and Midget?

Yes, this unit directly fits the 1974-1979 MG MGB and Midget equipped with the 1.3L A-Series, 1.5L Standard SC, and 1.8L 18V B-Series engines using the stock Lucas bracket layout.

Do I need to upgrade my main battery charge wire with this 95-amp unit?

While the alternator functions through the factory 3-pin plug, installing a supplementary fused 4-gauge power lead directly from the alternator output stud to the battery starter solenoid is highly recommended to safely carry the full 95-amp load without harness resistance heating.

The Classic British Caliber

Engineered to resolve notorious Lucas electrical bottlenecks, this high-output alternator provides period-correct exterior packaging alongside modern electronic reliability, ensuring your classic British roadster runs cooler, charges stronger, and maintains rock-solid ignition voltage.