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08-24-2006, 08:04 PM | #1 |
Scooby Newbie
Member#: 85146
Join Date: Apr 2005
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Parking Brake and Battery light come on as I drive
My parking brake and battery lights are flashing/stays on together as I drive. Doesn't really matter what I'm doing at the moment, it's almost seems random. I can just cruise along the freeway at 70 or sit at a stop light and then it flickers, some times it stays on for 30secs. I had my alternator checked at a local shop and they say its well within spec. Also replaced my battery about 6 months ago. Any ideas?
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08-24-2006, 08:23 PM | #2 |
Scooby Specialist
Member#: 66235
Join Date: Jul 2004
Chapter/Region:
Tri-State
Location: South Carolina !
Vehicle:2005 WRX Silver |
Odd...
As for the brake light, check your brake fluid & pads. Battery light- Would lead me to think low battery under 13.0 |
08-24-2006, 10:32 PM | #3 |
Scooby Guru
Member#: 4800
Join Date: Mar 2001
Chapter/Region:
TXIC
Location: Houston, Tx
Vehicle:1990 Legacy & OB XT AWD 6MT EJ22T AWIC Swap |
You're alternator is toast. Both lights are tied into the alternator's charging system.
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08-24-2006, 10:39 PM | #4 |
Trust no one
Moderator Member#: 11170
Join Date: Oct 2001
Chapter/Region:
Tri-State
Location: NYC
Vehicle:02 RAV4 MT 15 WRX/11 CRZ |
How thoroughly did they check the alternator? It is possible to have bad diodes and still see the proper voltage when checking with a meter, but the output will be "dirty" and will cause problems such as the intermittent warning lights you are seeing. For a full alternator check/diagnosis a scope should be used.
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09-06-2011, 09:30 PM | #5 |
Scooby Newbie
Member#: 274432
Join Date: Feb 2011
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i am having the same problem on my 02 wrx just wondering if you ever fixed it ? pm please
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09-10-2011, 07:27 AM | #6 |
Scooby Newbie
Member#: 156202
Join Date: Aug 2007
Chapter/Region:
SWIC
Location: Gilbert, AZ
Vehicle:02 WRX sedan WRB |
^me too. The battery and brake warning light are wired together - the brake light is just a side effect. Your alternator is probably dieing. I just replaced my alternator with a rebuilt one that I had tested at Autozone and came back good, and my voltage is low and those indicators are flickering. I did notice that the wiring harness that plugs into the voltage regulator (3-pin plug on back of alternator) is corroded, so I'm wondering if that's the problem.
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09-10-2011, 09:20 AM | #7 |
*** Banned ***
Member#: 16200
Join Date: Mar 2002
Vehicle:OK buy Nates beans westcoastroasting.com |
many rebuilt subaru alternators are garbage....it is a real crapshoot as to the rebuilt alternator being better than the one you are taking out
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09-10-2011, 04:06 PM | #8 |
Scooby Newbie
Member#: 156202
Join Date: Aug 2007
Chapter/Region:
SWIC
Location: Gilbert, AZ
Vehicle:02 WRX sedan WRB |
I had the new alt bench tested before installing and it passed. It's from a place with a good rep - Maniac Electric Motors, and has a 2-year warranty. Gonna do some more diagnosing today and order a new harness; even if that's not the cause, I want to replace my corroded one.
BTW - also bench tested my old alt on the same machine and it failed. |
09-10-2011, 05:44 PM | #9 |
Scooby Newbie
Member#: 156202
Join Date: Aug 2007
Chapter/Region:
SWIC
Location: Gilbert, AZ
Vehicle:02 WRX sedan WRB |
Figured it out. Engine wasn't grounded. There's a ground wire behind the intercooler, next to the pitch stop mount, that connects the firewall to the transmission. I guess that's the main engine ground? I'll have to search on that. On mine, the wire had pulled loose from the terminal on the firewall side, so it had a really crappy connection. Maybe that's what killed my old alternator too. Or maybe there's another ground somewhere that melted when my alt died...
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