I have a 1989 model Marinette Sedan Cruiser with twin Chrysler 318
engines. the alternator on the starboard engine was not putting out.
Voltmeters at both helm stations reading around 12v with engine
running 1500-2000rpm. Checked at output terminal to ground 12v.
Port engine checks 13.8v at same place. I had the alternator rebuilt.
Same thing!
I have cleaned all contacts to insure proper grounding. Checked
exciter voltage. It is 12volt with engine running.

The only thing left I can think of is direction of rotation. Does
this matter? The port engine is left hand rotation and the starboard
is right hand rotation. I wonder if the alternator needs to be
special. Anyone know?

Thanks.
Cal