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Old 06-15-2005, 06:54 PM   #1
arkady151
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Join Date: Jan 2005
Chapter/Region: Tri-State
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Default something wrong with my alternator?

Maybe I have a problem , maybe I am missing something or something I dont know about Subaru's. Anyway my headlights and interior lights flicker whenever I press the power window buttons , doesent matter if the car is cold or has been driven for 2 hours , it still is the same. It does it at idle and I'm pretty sure it somewhat does it at speed. The lights also flicker by themselves when the car is idling and the revs fluctuate (from 500 to 750). I'm planning to put in a car pc fairly soon and I just wanted to know if this was normal , I mean I'm sure its not or atleast I havent seen this on any other car , or like I said maybe I'm missing something. Thanks
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Old 06-18-2005, 04:02 PM   #2
langosta39
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Default Funny electrical stuff.

My 95 Legacy with a new alternator and battery does the same, and my friends 98 Outback does it too. It isn't terribly significant, but I can notice a dimming of my headlights and dash lights when stepping on the brakes or hitting the window buttons. If you could find a way to increase the idle speed it would get rid of that, but I don't know if that is easy or a good idea.

andy
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Old 06-18-2005, 04:09 PM   #3
Mulder
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Momentary dimming when you hit the window switches is normal, it's from the sudden increase in current demand for the window motor. If you hit the "up" switch with the window fully up the current is higher because the motor is stalled at the end of the window travel.
Flickering of lights at idle is NOT normal, and indicates a possible problem with the electrical system. You could have a weak battery or alternator. Take some voltage readings at the battery, and check the battery terminals and ground connections.
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Old 06-19-2005, 08:38 AM   #4
GravelRash
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Default

Sounds like wiring (including fuses/connections). Battery would have to be really weak to be part of the problem - and worth checking, and alternator wouldn't likely cause it (possible exception: very weak battery) because the battery would buffer any alternator fluctuations.

As Mulder says, check the battery connections, and battery ground first. Don't just look at them: disconnect, clean, and reassemble with some anti-corrosion pads and/or compound.

Then, since the flickering seems to be general, check the main power lead (you don't say which car you have...) which is usually a secondary line coming off the positive battery terminal, through the main fuse, and the fuse itself.
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Old 06-20-2005, 12:35 PM   #5
arkady151
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Thanks for the replies , the car is actually a 05 2.5rs mt . I'll check the battery , or if anything just take it to the dealership.
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Old 06-20-2005, 05:31 PM   #6
Mulder
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If it's an 05 just have the dealer check it, no need to mess with anything yourself on a brand new car.
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