disconect the postive battery lead and link it up tot he volt meter makes sure both voltage probes are in line i.e black probe on lead red probe on battery terminal.
Then check whats draining the car out.
The meter should read 0.5V or about 1V depending if your door is open, boot and the interior light is using ampage.
Not to pick fights, but your likely to blow the multimeter fuse doing that.
What you should do is disconnect the +ve terminal, whilst having the multimeter set to I (current - a 10A setting should suffice), connect the +ve lead of the multimeter to the disconnected +ve lead from the car, and the -ve lead of the multimeter to the +ve battery post. That will give a readout in
amps which will tell you the rough drain. It shouldn't be more than 0.05A (within reason), finding the parasitic drain is the main issue.
Finding a parasitic drain
