I have a 2004. Thanks so much for all of your very useful posts. I tried to perform the voltage evaluation from the display, and it will NOT display the voltage info. I hit the start once; hit the "Display" button; see the word "display" in the upper left corner, but as many times as I tapped in various places (desperation) in and near the corner of the box , on the word "display", and also the corner of the display. All with no effect. Reviewing the manual is totally worthless so far. Please clarify how to get to the 12 v battery voltage .