Mate has a FRST,but its draining the batt like theres no tomorrow...

Cars standard,and had 2 alternators,and 2 NEW batts,but its still draining it dry when he comes ot start it in a morning...

When he drives it all day,its fine,and wil start after using it,but if its leftover night,or for a long time,it dont wanna know????

Any idea guys???

Pete...