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Old 06-13-2008, 11:55 PM   #1
mimik
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Join Date: Apr 2007
Location: Chicago NW burbs
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2004 WRX

Default Electrical problem

Here is my problem, I drive at night from my parents house to my house 24 miles half way home my gauges my lights begin to flicker dim whatever. I tap the brake and lights dim alot and sometimes my radio loses power and my mirror compass resets, tonight when I taped my brakes and later when I turned on the high beams my ABS light came on. Couple days ago on my way to work in the morning I lost all electrical power for less than a second my speedometer and tach went down and I belive engine cut out but it was less then a second so I'm not sure if the engine died or not. Sorry for the long write up but I'm loosing patience with my Subaru. Would this be an alternator problem and if not time for a new car.
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Old 06-14-2008, 12:22 AM   #2
ProdriveDreams
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W/06 STi Drivetrain swap

Default

check battery terminals make sure they are tight and corrosion free. That would be my guess. This doesnt sound like a classic alternator persay but a bad diode will cause strange driveability issues so that COULD be the case, but i doubt it is with the alternator.
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Old 06-14-2008, 12:26 AM   #3
mimik
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The battery is brand new and the terminals clean, the thing is that this happens after few miles down the road not right away. I should also add that everything on the car is stock.
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Old 06-14-2008, 12:17 PM   #4
ProdriveDreams
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W/06 STi Drivetrain swap

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Quote:
Originally Posted by mimik View Post
The battery is brand new and the terminals clean, the thing is that this happens after few miles down the road not right away. I should also add that everything on the car is stock.
but are they tight??

And i would check tightness when it starts flickering not cold just because i've seen it twice where terminals are tight when cold and not when hot.

Also did all this start soon after this new battery?
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Old 06-14-2008, 11:21 PM   #5
Cougar4
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I first suggest you clean the battery connections using a battery post cleaning brush. Just to make sure there isn't a connection problem there. Then check the grounding from the battery to the chassis of the car. If that is ok then check to see if the power panel under the hood is getting full voltage from the battery when this trouble occurs. There may be a loose connection between the fuse panel and the battery. The ignition swich may be the problem also.
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Old 06-15-2008, 10:59 AM   #6
VA07WRX
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2000 4Runner

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It sounds like a bad ground to me. I agree with checking the tightness of the battery terminals. I would also look the engine compartment over for all the diffrent grounding straps and just make sure that one hasn't come loose.
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Old 06-21-2008, 02:18 PM   #7
mimik
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OK so I checked the ground and the battery connetion everything is clean and tight, last night I drove home it always happens half way down the road for first 10 miles everything is fine and than it happens when I got home I checked the voltage car was running, when I pressed braked pedal the voltage went down below 11.5. So I will take the car to check the alternator again.
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Old 06-21-2008, 03:44 PM   #8
Cougar4
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That sounds like a good plan. Check for a loose belt also.
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Old 07-23-2008, 10:56 PM   #9
Rice Boi
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2010 TDI CupEdition (DSG)

Default

Did you ever figure out what is wrong?

I'm having same issues (02' WRX)

Every morning since late last week, when I drive to work about 20min in, my stereo starts to flash on and off and I see my boost guage light pulsing and my cluster flashes on and off for a split second.

I do notice that my ignition makes a buzzing noise if I don't turn the key quick/hard enough when I'm trying to start the car. It has been doing this for over a year, I wonder if this could be the cause since the ignition cuts all accessories when you crank the motor. I wonder if this is somehow grounding out due to wear and tear which might be cause all of my accesories inside the car to flash on and off.

What do you guys think?
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Old 07-23-2008, 11:37 PM   #10
Cougar4
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It appears to me the regulator in the alternator is failing. You most likely are going to have to replace the alternator.
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Old 07-24-2008, 10:12 AM   #11
rexu
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Default Options

What would be the a good brand for replacement? i have heard mixed stories about various brands? also for the WRX owners would it not be a good upgrade at that point to have the STI unit installed?
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