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Thanks for the replies. Let me see if I can answer all the questions.
The boat it is a 1983 Vagabond 42. The engine is a Yanmar 75 hp 4JH-DTE from around 1985ish. I have no idea about the alternator as I don't have pictures and I'm not at the boat at the moment. Looking at the Operations Manual for the engine shows it as a 12V 55 amp alternator (how regulated unknown). All the equipment mentioned above (except the ProMariner) came as is with the boat and is how I 'think' it is currently wired as the wiring is a mess and I haven't started taking things apart...yet. The ProMariner replaced the original 3-bank 30amp charger that was in the boat. True the 8D is overkill for a starting battery but it was in the boat when I got it so it will stay until it dies (it's about 5 years old) and then I'll replace it with a smaller starting battery.
Two of the batteries (#1-starter and #2-electronics/lights) are located next to the engine (under the steps about in the center of the boat). The #3 battery is located about 2/3 forward underneath a port settee and runs only the refrigerator and the 2500W inverter (both which are right beside the battery)...as far as I can tell.
I'm open for some good options on how to cheaply simplify this configuration. I definitely want the #1 starter battery to remain the main starter battery but be able to select the others if it dies. A wiring diagram showing alternator, ProMariner Charger (using 2- or 3-bank depending on your design), 2 Perko switches, 3 batteries, and possible BlueSea ACR if added, would be worth a thousand words :-) Thanks again.
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