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Old 03-03-2010, 02:29   #1
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Join Date: Apr 2003
Location: back on Gold Coast after sailing north to Thailand then east to Pacific via Irian Jaya, PNG & Solomons
Boat: Tennant 47ft Catamaran
Posts: 306
Alternator Tested Fine but not Charging

I have twin Yanmar 3GM30 diesel inboards on my cat. The previous owner had an external voltage regulator fitted near the starter battery on each engine. The alternator on one engine has stopped charging. The fuse in the excitator from the external voltage regulator had blown and was replaced. The alternator started charging again but has stopped again. The fuse was checked but has not blown. I removed the alternator and had the marine electrician check it and it is fine.

any ideas as to why the alternator is not charging?
Paul & Kaspar de Wonda Dog
S/V "Pelican V"
"Trust not a living soul and step warily around the dead"
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Old 03-03-2010, 03:13   #2
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Balmar has a nice troubleshooting guide. It might give you some ideas even if your gear's another brand.
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