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FWIW, a "rebuilt" alternator means "we fixed it". A "remanufactured" alternator is literally torn down to the frame and every part of it is tested and replaced to meet or exceed the new OEM specs, so a commercially remanufactured alternator will be the better choice when available.
When a local shop "rebuilds" they usually just replace a bearing, or regulator, or diode frame, whatever failed or looks like it is about to fail. And if they've merrily repainted the entire alternator shiny silver? Make sure they didn't get any paint on the diode frame itself (inside the vents) because even one coat of paint will cause the diodes to overheat and fail down the line.
I'd also be leary of putting an automotive alternator near a marine gasoline engine. Consider, at least, retrofitting or adding metal (aluminum or better copper or brass) window screening material in a way that emulates the original screening, the purpose of which is to interrupt a flame front and give you a little fire resistance.
While many Delco and AC/Delco alternators can be swapped, they have different specs. Most available from their web sites or with a phone call. Some of them develop power at somewhat different shaft rpm ranges, so if you are swapping one "Delco" for another, check to see if you also want to *change* the pulley size to keep the alternator running in the best rpm range. (too slwo = slow charging; too fast = burns it out.)
Last edited by hellosailor; 07-11-2010 at 07:19 PM.