I've got a 51 amp Prestolite/Leece-Neville alternator at the moment that has some problems (Lots of rust, bent fan, etc) but still charges. I'm planning on replacing it because I don't trust it and will be going on a short vacation at a lake with the boat next month. I don't want the alternator to mess up our plans.
I'm currently running an old 200 watt HiFonics amp and the factory 35x4 head unit and have had no problems with the 51 amp keeping up.
Long term I may go to a dual battery setup w/ isolator so I don't have to worry about draining my cranking battery. I may also go to a 5 channel amp and add a 10" subwoofer but nothing expensive. I have no plans to ever spend more than $800 or so on a "system".
The boat is an '00 MasterCraft Maristar 230 VRS with the Indmar LTR. The mounting bracket restricts my ability to jump way up in capacity without somewhat major surgery on the bracket. There's no room for additional case diameter.
My cheapest replacement option at the moment is a 65 amp direct replacement at $71. Based on my above "hopes and dreams" should the 65 amp be sufficient?
I have the option to go to a 90 amp in the same diameter case but it's double the price @ $152. I'd have to put a heavier charging wire in but would this be worth it/necessary?
I talked with a local rebuilder and he said it wouldn't be worth reworking mine given the physical condition and the case is too small for adding much extra amperage.