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Old 10-19-2012, 04:50 PM   #1
Apex3
Scooby Newbie
 
Member#: 171926
Join Date: Feb 2008
Location: Renton, WA
Vehicle:
1991 Legacy Turbo
1988 M3

Default What's killing my battery?

Car is a 91 Legacy Turbo

I've been having some battery issues lately, my car will start up fine when it's cold, 14V while running, then as I drive it'll slowly drop, gets to where I have to rev it a bit to keep it going at lights, and turn off my accesories, if I drive for too long then park, I can't start it up again, but it seems to reset over night. I've replaced the battery cables as well as the main ground, and the wire that goes from the fuse box to the battery, and this did mostly fix it for a while, but it still stayed at a lower than normal voltage while driving until reverting to the same issues, the cables were fairly corroded so it makes sense replacing them would have helped. Running accessories kills it faster, especially the defrosters and headlights.

At this point I'm thinking it's either the alternator or the battery, O'reilly's says my battery is good, but then again it's O'reilly's, the alternator's about 6 months old, but it's from Autozone, so who knows on that.

Edit: dammit, can a mod move this to electrical?

Any thoughts on this? Never had electrical issues with previous cars...I'm gonna take the alternator to get tested but I don't really trust them to give me a good answer unless it's completely dead.
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Last edited by Apex3; 10-19-2012 at 07:59 PM.
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Old 10-19-2012, 08:58 PM   #2
Wrxtuner251
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Member#: 135150
Join Date: Dec 2006
Chapter/Region: South East
Location: Fayetteville
Vehicle:
2006 WRX Sedan
Blue

Default

Hello apex3
I am unfamiliar with the 91 legacy turbo engine im guessing 2.2L? Anyway from what you described im leaning way toward alternator. You got it from autozone zone im guessing it is a duralast? If so, swap it; only if its bad. They should be able to test them and if its bad 6months it should be under a one year warranty as well.

Good luck
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Old 10-19-2012, 09:34 PM   #3
eg33GC
Scooby Specialist
 
Member#: 206851
Join Date: Mar 2009
Chapter/Region: MWSOC
Vehicle:
99 V4
EJ20K RS

Default

The early voltage regulators are not known for being too extremely robust, but I would first advise some ground cleaning and ground work.
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Old 10-19-2012, 11:31 PM   #4
fxt05
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Member#: 208521
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
'96 STI Type RA
'05 FXT

Default

I cant help with the battery but I'm extremely jealous of your E30 M3
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Old 10-20-2012, 01:50 AM   #5
Apex3
Scooby Newbie
 
Member#: 171926
Join Date: Feb 2008
Location: Renton, WA
Vehicle:
1991 Legacy Turbo
1988 M3

Default

Got the alternator checked and it actually was no good, replaced under warranty. Yes it's a Duralast but I got one for free so I'm not gonna replace it with something else just yet, if it happens again I will. Drove it around a bit and seems to be working fine now.

Things always seem to work out just after I make a thread but hey at least it's fixed.

Quote:
Originally Posted by fxt05 View Post
I cant help with the battery but I'm extremely jealous of your E30 M3
Haha thanks, I love it. I'm jealous of your GC
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