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give me the year of your engine and I'll scan the wiring diagram and send it to you or post it here.
You should check the output terminals on the alternator with a voltmeter to see what volts you're producing at about 30% throttle. Then move back to the rectifier and check that.
Of course, make sure you do the "no-brainers" like clean and protect the corroded connections, check and clean the battery terminals, and make sure you're not drawing more power on your boat than the alternator can supply.
As far as hooking them up, you should have four things: Ground, red which is power from your alternator to the rectifier, yellow for a "sense voltage", and a fourth wire to "excite" the coils. This last wire can have a lamp in series which would light when the alternator is bad because the wire grounds after the coils excite and start making power.
hope that helps. let me know about the year and whether or not you've got electric start.
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