intermittent battery light
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This is a discussion on intermittent battery light within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; My wrx has been exhibiting some strange behavior recently. The brake light and battery light will flash on/off momentarly. When ...

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    Smile intermittent battery light

    My wrx has been exhibiting some strange behavior recently. The brake light and battery light will flash on/off momentarly. When the two lights are on, the running lights will go off. The alternater is charging OK even when the instrument light is on. Any thoughts?

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    My first thought would actually be faulty alternator. How do you know the alternator is OK?
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    Quote Originally Posted by dblrz1 View Post
    My wrx has been exhibiting some strange behavior recently. The brake light and battery light will flash on/off momentarly. When the two lights are on, the running lights will go off. The alternater is charging OK even when the instrument light is on. Any thoughts?

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    I measure the battery voltage. With the light on, it still reads 15V

  6. #5
    Registered User JMack's Avatar
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    Okay,

    That doesn't mean the alternator is working.

    All the 15V on the battery means is that the battery is good. Your car runs off of the alternator after the car has started, and the alternator charges the battery.

    Take the negative cable off of the battery (the one from the alternator), and if your car stays running, your alternator is prolly good, if it stalls, get a new alternator.

    Problem solved.
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    Well, I checked the voltage with the car running, then again when the ignition is off. Batteries that I have measured rarely exceed 12.7 V.

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    Intermitent Light uppdate

    I have eliminated the alternater. Something else is causing the battery and hand brake light to come on. Anyone else experience this? When the battery/brake lite come one, the running lights will go off.

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    Quote Originally Posted by dblrz1 View Post
    I have eliminated the alternater. Something else is causing the battery and hand brake light to come on. Anyone else experience this? When the battery/brake lite come one, the running lights will go off.
    This is awesome! There are so many posts talking about the same stituation! I have only owned the car for two days and have had this problem! I replaced the battery with an optima red, and also replaced the alternator! I still have both warninglights come on while driving and my headlights turn off? its an awesome thing to have happpen in traffic on the I-5 during rush hour! I can't wait until tommorrows commute!!!!!

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