Bad Alternator?
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This is a discussion on Bad Alternator? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hello everyone. I have a JDM 1995 Impreza STI (95,000 km on the engine), and I have been experiencing a ...

  1. #1
    Registered User AmnJoker333's Avatar
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    Feb 2012
    Misawa AB, Japan

    Bad Alternator?

    Hello everyone. I have a JDM 1995 Impreza STI (95,000 km on the engine), and I have been experiencing a little trouble with it lately. The voltage meter next to my boost gauge fluctuates occasionally, causing my headlights to brighten and dim while I am driving, but it doesn't happen all the time. Also there is occasionally a squealing sound when I first start my car, and will occur when I am idling the engine at a stoplight, or driving in the lower RPMs, but will go away at higher RPMs. Would this indicate a bad alternator, or something else? Can an alternator alone cause this squealing? Would the belt cause the voltage fluctuations? Thanks!

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  3. #2
    Good news, everyone! xxxxxxxAnub1s's Avatar
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    Jan 2005
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    The belt being loose will cause the squeeling and if it is slipping will cause a drop in alternator output, yes. I'd recommend replacing your drive belts.
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    Good news, everyone!

  4. #3
    Registered User jgardiner's Avatar
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    Oct 2010
    Calgary, Canada
    Also make sure that your battery terminals are clean.

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