Hi Loren,

Like most electrical issues its a case of logical elimination ..so first charge the battery, disconnect one of its terminals then see if it still looses charge overnight. Obviously if it does then the batteries is faulty. If not then you know its in the wiring loom somewhere. Then install an ammeter between the battery terminal and the battery cable. If its the loom you'll see a current (leave the ignition off, the current should be very small since only the clock should be on). If the battery discharges overnight then this will likely be 3 - 5 amps. With the doors and trunk lid closed, and the bulbs removed from the under hood lights, check the current. Now start pulling fuses one by one (there is a fuse label in the lid) and note when the current changes. That should at least track down the earth leak to one circuit area.