You will need a dc ammeter. Most multimeters have them built into it. Take the positive cable off of the battery and hook the meter between the cable and the meter. Make sure your meter is in the dc ammeter mode. Find the fuse box on your car. Start pulling the fuses out one at a time until the meter amps go down to almost zero. They wont go all the way to zero because if your door is open the dome light will be on if your fuses are inside the car. Be sure you pull one fuse at a time and read the meter then replace the fuse and then pull another one. When you find the fuse that has the amp draw on it you will know which circuit to repair.