Have Subaru Questions? Ask a Subaru Mechanic and Get Answers ASAP
Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.
Sounds like you have a parasitic drain. You need a multi meter to diagnose. You have to hook up the ammeter inline with the negative battery cable and see how many amps are drawn when the vehicle as resting.
If its high, you need to remove fuses one at a time until the draw goes down. This will narrow down the circuit.
Do you have a battery charger?
Can you jump start it?
if you jump it and let it run for a while it will recharge the battery.
Ok. I will leave this post open.
I suggested jump starting and by doing that you may have noticed the cables being loose. I also suggested doing the drain test for a dead battery, If this would have been done you would have also noticed the battery cable being loose.
I am glad you got it figured out. Usually a good idea to start with the simple stuff.
You said that the battery was already replaced so I assumed it was properly installed.