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lights dim when shifting

This is a discussion on lights dim when shifting within the Firebird / WS6 forums, part of the Vehicle Specific category; When i shift my all of my lights dim, headlights fogs, as well as interior gauge lights. Is this a ...

  1. #1
    Junior Member K_garretson23's Avatar
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    1979 trans am

    lights dim when shifting

    When i shift my all of my lights dim, headlights fogs, as well as interior gauge lights. Is this a sign of a bad battery or alternator? Would replacing either fix the problem. Its not significant it just annoys me. It only happens when the rpms drop during a shift leading me to think its an alternator issue. No other electonics have been added to the car. 02 ws6 btw

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    Senior Member JayTA98's Avatar
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    Mean Black
    1998 Trans Am

    Quote Originally Posted by K_garretson23 View Post
    When i shift my all of my lights dim, headlights fogs, as well as interior gauge lights. Is this a sign of a bad battery or alternator? Would replacing either fix the problem. Its not significant it just annoys me. It only happens when the rpms drop during a shift leading me to think its an alternator issue. No other electonics have been added to the car. 02 ws6 btw
    what's your voltage?

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    Moderator 35th-ANV-SS's Avatar
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    Sounds like your alternator to me.

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    Junior Member K_garretson23's Avatar
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    voltage is fine but drops with the rpms

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    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by K_garretson23 View Post
    voltage is fine but drops with the rpms
    You can always pull the alternator and go have it tested. I almost guarantee though that is what it is

    Check the wiring on the back side of the alternator to make sure nothing came loose or is corroded first! Also make sure your battery terminals are clean and that you have a good, secure connection at the battery.

    Have you recently installed anything new?

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    Member godless-phoenix's Avatar
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    Blackened fire chicken
    2000 Pontiac Trans Am WS6

    sort of had a similar problem, replaced the alternator and it fixed it my lights would sort of flicker with the engine idle, it was really annoying...im glad its gone

  7. #7
    Junior Member K_garretson23's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    You can always pull the alternator and go have it tested. I almost guarantee though that is what it is

    Check the wiring on the back side of the alternator to make sure nothing came loose or is corroded first! Also make sure your battery terminals are clean and that you have a good, secure connection at the battery.

    Have you recently installed anything new?
    I'll have to check the wires and terminals. Nothing was done electronic wise to the car. All i have done were fog bulbs. Mods to the car are pacesetter longtubes catless magnaflow exhaust and a lid, if that could make a difference?

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    Senior Member justinmc978's Avatar
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    Quote Originally Posted by K_garretson23 View Post
    I'll have to check the wires and terminals. Nothing was done electronic wise to the car. All i have done were fog bulbs. Mods to the car are pacesetter longtubes catless magnaflow exhaust and a lid, if that could make a difference?
    nope. our cars have notoriously weak alternators, put an underdrive pully on a used factory alt. and you'll have a stobelight effect going on. there are some really good aftermarket products out there, I've also heard some alternators from trucks swap over and are more powerful if you want to stay factory.

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