I am of no help on a replacement alternator, however, many of the older alternators needed to get above 1500 RPMs to excite the alternator field and start charging. One of the first time I took my boat out I had previously only run it at idle in the driveway, then idles through a no wake zone and idled across the lake. Didn't want to start once we were ready to ski. Easy to check. Might also get your battery tested to eliminate it as a possible source.
Two 14" 5 lug S5 wheels with ST205/75R14 Kenda Loadstar radials $349
Two 14" 5 lug S5 wheels with ST215/75R14 Kenda Loadstar radials $389
Two 15" 5 lug S5 wheels with ST205/75R15 Kenda Loadstar radials $409
Mounted, balanced and delivered.
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CARBURETOR REBUILDING - $199
Parts, labor and return shipping included
2 LED 6" BRAKE LIGHTS DELIVERED $32