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Yes I have an ohm meter and know how to use it.
I checked the charging output at the battery terminals. The fully charged bat was at 12.42 v before starting. after starting it dropped to 12.37v.
I started and stopped it several times to put a draw on the bat. It kept dropping and was at 12.3v when I shut the engine off. When out on the lake the bat drops lower and lower.
I have been using a battery charger to recharge at home.
OK...I'm not actually near the boat now. Its up at the lake.
I have printed off the instructions above (There seems to be a typo in the 1st line. Can you clarify that please) and will check the rectifier and get back to you.
that makes sense. I will get back to you later.