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I would be glad to assist you. I will need some more information.
When you try to start the vehicle does it make any noise?
Does it make a single or multiple clicking noise?
One single click indicates a starter failure. The starter is getting signal, but is not engaging because the brushes inside the starter are not making a connection.
This is the test procedure per Subaru:
Your concern is outlined in Magnet Switch Operates (clicks are issued). All of the probable causes are internal starter issues. I have included an internal diagram of the starter in case you would like to attempt to repair the internal components:
I would recommend replacing the starter as an assembly.
Please let me know if there is anything else I can do to assist you.