Replacement 12V 40A alternator for Vetus M2 and M3 series marine diesels. Direct replacement for Vetus part numbers STM1655 and STM3931 — the alternator fitted as standard on the M2.C5, M2.D5, M3.09, and M3.10.
✔️ Direct fit for Vetus STM1655 / STM3931 — no modifications required
✔️ 40 Ampere — the original specification for this engine series
✔️ Supplied brand new with internal voltage regulator
Vetus
Vetus used multiple alternator variants on the M2 series. This version replaces STM1655 and STM3931. Does your M2.04 or M2.06 have an alternator with part number STM1243? If so, choose our other 40A alternator (Solé/Vetus version). Always compare the part number on the identification plate of your old alternator.
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