That is easy to track down, ok full charged battery, then connect an inductive pickup ammeter that can read milliamps around the positive battery cable make sure all lights and doors are closed and read the drain on the system anything more that .003 amperes is excessive remember that the PCM has a KEEP ALIVE MEMORY and that cannot be shut off so don't worry about that it's so slight that you won't see it.
if you see a drain start unplugging fuses one at a time and lay them out so you know where they came from, keep goin until you get a drop on the reading and that is the circuit that is draining current.
How long does it take do drain a full charged battery? If you have questions call me 253-691-6206
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Check glove box lights
trunk lights
underhood lights
aftermarket alarm systems
Amps for the stereo
A bad alternator can drain a battery
Hope this helps thanks please rate this a fixya if you feel I have provided good advice and please keep in touch with me I'll get you through this