Upgrade alternator, 60 series, 70A-24 V, double foot mount 3.15″, 6 groove pulley, isolated ground applicable for many Yanmar, Westerbeke, Lehman & Perkins-Sabre engines.
Alternator individually also functional without external regulator or as a set (YP):
consisting of: alternator, MC regulator, 2 temperature sensors and mounting material available