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Old 11-28-2008, 11:11 PM   #1
Scooby Specialist
Member#: 170439
Join Date: Jan 2008
Location: Sioux Falls, SD
I <3 Lamp

Default Alternator or voltage regulator?

I'm having an issue with my 02 wrx, it's got the stock alternator on it still and what its doing is sometimes when I'm driving recently it'll show 14.5-14.7 Volts on my turbo timer at first then it'll spike up to 15.7 or so then back down, on and off. While this is going on it'll flash the battery light also.

Pretty sure it's the regulator which I'm guessing it's on the alternator. Does anyone got any idea if it is or not?
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Old 11-28-2008, 11:53 PM   #2
Scooby Guru
Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
2001 LL Bean Outback


You are correct. The regulator is inside the alternator. It looks like you need to replace the alternator.
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Old 11-29-2008, 02:19 AM   #3
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Member#: 33868
Join Date: Mar 2003
Location: Chesterfield, MO
2003 wrx


The battery terminals are clean and tight correct?
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Old 11-30-2008, 03:57 AM   #4
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Join Date: Jan 2008
Location: Sioux Falls, SD
I <3 Lamp


it was the regulator, swapped it with an 02 outback one, works fine. 10 more amps and a hundred fifty dollars less than the wrx one!
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Old 11-30-2008, 08:15 AM   #5
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the outback is 85amps??
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Old 05-18-2013, 01:32 AM   #6
Scooby Newbie
Member#: 353711
Join Date: Apr 2013
Chapter/Region: International
2002 WRX Wagon


What part number did you use? I am having the same issue and wouldn't mind upgrading to the higher amperage as well.
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Old 05-18-2013, 05:23 AM   #7
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Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
02 WRX
15 WRX/05 GTO


This thread is from five years ago. Please don't bump old stuff.
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