I had battery problems with my wrx for 2 months.
Ended up buying 1 remmaned alternator,about 5 batteries(one being an optima),A bunch of ground cable,and finally taking out the starter and bringing it to advance auto to get tested and turns out the starter was bad.So i spent about 900$ on that one problem.
Fuck troubleshooting.
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"You can always count on the Americans to do the right thing - after they have tried everything else."
-Winston Churchill