Alternator Yanmar 1GM10 | 2GM20 | 3GM | 3HM | 3JH | 4JH – 12V 40A

Description

Replacement 12V alternator (40A) with internal voltage regulator for classic and modern Yanmar marine diesel engines from the GM, QM, HM and JH series. A proven replacement for the original Hitachi alternators on these engines.

✔️ Internal regulator – simple, direct connection
✔️ Fits a very wide range of Yanmar marine engines, including saildrive versions
✔️ Replaces numerous Hitachi LR135 variants

Technical specifications

• Voltage: 12V
• Charging current: 40A
• Internal voltage regulator
• Diameter: 74.0 mm
• Connections: BAT = B+ (battery), horizontal connector S+ (voltage via ignition switch), vertical connector T → L (indicator light)

Suitable for the following marine engines

• Yanmar GM series: 1GM, 1GM10, 1GM10C, 1GM10L, 1GM10VE, 1GML, 1GMY, 2GM, 2GM20, 2GMF, 2GMFL, 2GMFY(E)-E, 2GML, 2GMYE-EC, 2GMZ, 3GM, 3GMD, 3GMF, 3GMFY-E, 3GMLE, 4GM
• Yanmar QM series: 2QM15, 2QM20Y
• Yanmar HM series: 3HM, 3HMF
• Yanmar JH series: 3JH2, 3JH3, 3JH3Z, 4JH, 4JH-HT, 4JH-HT-Z, 4JH-T, 4JH-TZ, 4JH2L-HTNE, 4JH2L-TNE, 4JH3, 4JH3ZA, 4JHZ
• Yanmar saildrive/reverse gear: KM2A, KM2P, KM3V

OEM for reference

• Hitachi: LR135-86, LR135-86C, LR135-86F, LR135-95, LR135-95B, LR135-115, LR135-127
• A1T25077, A1T25083, A001T25077, A001T25077ZC
• 121400-77201, 124080-77201, 128170-77200, 128170-77201, 128170-77202, 128171-77200, 128270-77200, 128270-77201 (also without hyphens)

Note: Always compare the connections and diameter with your original alternator before ordering.