Pictured at right, is a basic Hitachi 55 amp 12 vdc alternator. It is one of the standard alternators
initially provided on a large number of Yanmar diesel engines. If you look carefully, it has simple
modifications that have major ramifications. The internal single stage regulator is bypassed and new
wiring is provided so that an external regulator may be used. The net result
of this modification is to provide a proper, reliable, 3 stage charging source from your standard basic
alternator. This is critical sometimes to ensure proper fit and alignment without modifying the standard
connecting arm(s), attachments, or v-belt for various optional alternators that have not been specifically
designed as a direct replacement for your alternator and it's possible unique installation requirements.
Some smaller vessels do not have the need or adequate room for a second high output alternator. The end
result of this base modification ensures a proper charging source is available for even the smallest of
systems.
For larger vessels, this modification will allow your entire system to be properly designed and
implemented with full three stage charging from every source. The alternative is severely shortened
battery life for those items being charge by the single stage charging source.
