Question

While out on the water this weekend for the first time this year since winterizing last year, the warning audible came on and the engine indicator began to flash after about 5-10 minutes. I checked oil, temp, battery but everything appeared to be fine. The boat has 385 hours on it. I disconnected the battery to see if it might reset the computer, but the same thing happened. We ran the boat on Friday and Saturday by pressing stop and then restarting. However, on Sunday after I had disconnected/reconnected the battery cables, we started out and got about 30 minutes out having to once again stop/start, but this time the engine wouldn't turn over after about the 4th time. It sounded like a dead battery at that point, but by this point I was so tired of messing with it we just towed it back and put it on the trailer.
My brother-in-law is a mechanic/engineer and used to work on pwc's, he is going to check blogs...but believes that a computer diagnostic test would give me the best answer.