Date registered: Feb 2009
Vehicle: '04 S430
Location: Murphy, TX
Mentioned: 13 Post(s)
Quoted: 29 Post(s)
You can try the battery voltage display. Car on, engine off- milage display. Hit the "R" button 3 times real quick. The display should change to battery voltage.
Start car and see what it shows. It ideally should always be over 13 volts.
Car starting should not drop below 10.5 on a good battery (so I've read on these here forums anyways).
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-16 T&C (whole family van)