Hi All, Does anyone know what fault condition brings on the red battery symbol on the dash. Is it a fault with the alternator or is it a fault with the battery. I haven't had the red light come on but the battery is flat. By knowing which one would bring the indicator on I was hoping to determine which could be at fault. I'll investigate further tomorrow but was just wondering if anyone could shed some light on it before then. Car is an S4 Cab and i'm hoping it is going to be the battery rather than the alternator. Thanks in advance for any help.