Two weeks ago unit would not re-start after shutting down to fuel. Error code showed 03-09 and 03 14.....low voltage.. battery was only two months old. Tried jumping it and it just shut down after hitting start button. Took starter to a shop and had it rebuilt and took battery back to Rural King where they tested it and said it was bad and replaced it under warranty. Yesterday it started right up and I used it for eight (8} hours straight and shut it off to fuel. Wouldn't start back up but error code showed ....none.....Checked battery with multi-meter and it showed 11.68 volts. Reached in and checked belt on alternator and it was tight. After jumping it, it re-started. Does this mean the alternator is bad and/or what else would cause the problem? If it is the alternator, why no error code? All grounds are clean and tight. Any help would be appreciated. Thank you.