charging voltage was at 13volts? this is low, check it with the loads on, high beams, blower fan, and defroster.
Should not be below 13.5. I would recommend getting the alternator tested.
A draw test should be performed without disconnecting power from the vehicle.
Start the engine, lock and close all doors. install a jumper between the neg bat post, and bat cable. This will allow the connection to not be broken when installing the multi meter leads. then installed your multi meter leads and remove the jumper wire. You do not want to remove power from the vehicle after shutting down the car and closing the doors. Also activate the alarm when doing the test.
By disconnecting power you reset all of the modules and there could be a module that is not going to sleep causing a battery draw.
Also i have seen on this engine the A/C clutch relay will stick and cause a high amp draw. Try removing the relay or replacing it.
after an hour of letting the vehicle sit with the key off and doors all locked, draw should be below .025amps.