Review on ⚓ DB Electrical AHI0059: Yanmar Marine Diesel Alternator (Hi-Output 80 Amp) - Compatible/Replacement for 3Jh2, 3Jh3, 4Jh2, 4Jh3, 4Lh, 6Ly Engines - LR180-03C & 84150 Compatible by Damon Fuqua

WARNING: This alternator is set at 14.7 volts which will cause your batteries to overcook at high temperatures. The good news about this alternator is that it is a perfect match for the Hitachi alternator that was replaced on my Yanmar 3GM30 diesel engine. It was a plug and play replacement and it worked. However, the pulley was black plastic, not the brass shown in the picture of the item. It's rated for 80 amps, but I haven't tested that. Having just installed it, I can't comment on its reliability. Note, however, that this alternator is preset (and not adjustable) at 14.7 volts, which is significantly higher than the 14.1 to 14.4 volt setting you typically find on internally regulated alternators, at least on boats . This voltage causes batteries to gas and boil when the ambient temperature is above 75 degrees. Those who intend to work at temperatures above 80 or 90 degrees can consider another model that does not generate such high voltage. Or at least keep an eye on the water level in the battery.