Battery drain

Tiny
CHRIS DAKE
  • MEMBER
  • 2003 SUBARU OUTBACK
  • 2.5L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 322,000 MILES
So every time I go to start my car my battery drains by 50% I just in stalled a new starter, alternator is good fuses are good, I just installed a new IAC sensor, as well. I need to figure out what's killing my battery. Battery is brand new. Seems like I'm not getting enough volts but don't know where to look at this point. I know I have a failed injector seal that's been dumping gas into cylinder 4. So it's struggling to spark and get the rpms up in order to run. At the same time my volts drop instantly. Any help or leads would be appreciated.
Saturday, September 20th, 2025 AT 2:41 PM

5 Replies

Tiny
CHRIS DAKE
  • MEMBER
  • 27 POSTS
Also need a guide to replacing the injector O- rings
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Sunday, September 21st, 2025 AT 12:49 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Please start another thread for the fuel injector issue, we only handle one problem per question. We we solve the battery drain on this one, I would pull the AC compressor clutch control relay to see if the drain stops, here is the location of the relay and a great guide for you to go over as well.

https://www.2carpros.com/articles/car-battery-dead-overnight

The relay is located in the fuse panel on the left side of the dash. Check out the images (below). Let us know what you find.
Image (Click to make bigger)
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Monday, September 22nd, 2025 AT 12:34 PM
Tiny
CHRIS DAKE
  • MEMBER
  • 27 POSTS
Thank you will do that right now.
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Monday, September 22nd, 2025 AT 3:02 PM
Tiny
CHRIS DAKE
  • MEMBER
  • 27 POSTS
That worked perfectly. It fixed the issue instantly.
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Monday, September 22nd, 2025 AT 3:53 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
YAY!! Can you please leave us a rating?

https://g.page/r/CZdEnyCkGgm6EB0/review

and

https://www.sitejabber.com/reviews/2carpros.com

Thank you :)
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Monday, September 22nd, 2025 AT 5:30 PM

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