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Old 08-13-2019, 08:03 AM   #1
foxmch
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Default 2017 WRX - battery died twice in a year

I have some aftermarket electrical stuff hooked up but unsure if that's the cause. Have my fog light switch back with LED hooked up to run instead of my high beams for DRLs. That's through an add a fuse in the fuse box under the hood. Also have intererior footwell lights tapped into the driver side interior fuse box with another add a fuse, so they come on only when my headlights are on. Any ideas?

Basically, I'm wondering if one of the fuses I'm tapped into sucks power from the battery even when the car is off.
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Old 08-13-2019, 08:29 AM   #2
Mulder
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You can test the circuits with a meter or test light to see if they are energized with the key off. Even if they are, there shouldn't be any drain unless the attached lights or devices are turned on.
The OEM batteries are known to be crappy and sometimes they just die so it is possible you have a bad one and it needs to be replaced. If the car sits a lot and/or you take mostly short trips that doesn't help either. Also a parasitic drain test can be done to check the standby drain to see if it's excessive, with everything turned off and the car locked there should be no more than 50ma or so of drain after allowing time for it to go into sleep mode.
Make sure the battery is charging when the car is running. Voltage at the terminals should be around 14V. Sometimes the ECU will limit charging so you may see a lower voltage, if this happens turn on the lights and see if the voltage goes up to 14. If it does that's normal. A 2017 should have more consistent charging, 2015's were more stingy with charging but this was addressed in updates and later MY's.
Depending on your mileage a 2017 may still be under warranty, so if it appears the battery is bad you might be able to get a new one although if the replacement is of equal quality to the original it may be better to buy a higher-quality one on your own.
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Old 08-13-2019, 09:47 AM   #3
2016WRX_CT
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I had a battery issue for a long time too. I upgraded to a Napa Legends and have had way less issues since then.

However, because you have aftermarket electronics, I would highly suggest performing a Parasitic Draw Test.
https://testmeterpro.com/parasitic-d...-a-multimeter/

If the number you get is higher than 50 mA, then you probably have a system staying on when your car is off. Make sure you take step 1 seriously as the Subarus normally take 5-10 minutes before powering down completely.
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Old 08-13-2019, 09:56 AM   #4
anarekist
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depending on when your car was manufacture it may have the old ecu firmware that didn't adequately recharge the battery so slowly the battery just loses charge, worse if you mostly take short drives.


https://forums.nasioc.com/forums/sho....php?t=2800712
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Old 08-13-2019, 10:01 AM   #5
2016WRX_CT
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Quote:
Originally Posted by anarekist View Post
depending on when your car was manufacture it may have the old ecu firmware that didn't adequately recharge the battery so slowly the battery just loses charge, worse if you mostly take short drives.
... Good to know... This is the exact issue I've had. basically the car seems to hate it when I run it for less than 10 minutes, has trouble turning over after I do...

Any way to fix this? Maybe an ECU firmware update?
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Old 08-14-2019, 03:29 AM   #6
Craig_Spitz
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Do you know if it could be caused by your climate? I've had batteries die on me when it got too cold out.
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Old 08-14-2019, 10:44 PM   #7
DrD
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two different batteries died, or the same battery died twice? Curious if you checked the voltage across the battery when it's at rest, and when the car is running. Make sure your charging system is working properly. Then - if you are concerned one of the components you added is causing the problem, pull the fuse or disconnect it and see if the problem goes away (a parasitic draw test is very helpful, too)

If it's the same battery, be mindful that lead acid batteries respond very poorly to deep discharges - once you've killed it, it's a good idea to go ahead and replace it (particularly before winter)
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