George, a lot depends on what you mean by not starting. Does it crank but fail to start or does not crank? If the engine is hydrolocked, it won’t crank at all. If it cranks, chances are it is just an electrical issue and there is a reasonable chance drying will allow it to start. I don’t think it would matter if the alternator is wet or not. It should still crank (unless hydrolocked) and run off the battery.