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Thread: Alternator Issue

  1. #1
    Member maxwell6's Avatar
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    Alternator Issue

    Fried another alternator this week, that will be 3 now. It seems like every couple years my alternator goes. Was on my way home smelt electrical smoke then noticed smoke from under dash, pulled over and alternator was smoking and seized. Also snapped the belt. Anybody else have this problem. Vortech supercharged. Was driving normal when it happened, 404 north bound at rush hour.

  2. #2
    Admin ZR's Avatar
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    O'drive crank pulley or stock?
    Has battery gone flat / car boosted?
    Battery front or trunk?

  3. #3
    Member maxwell6's Avatar
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    Stock crank pulley, Battery good,boosted, battery in trunk.

  4. #4
    Admin ZR's Avatar
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    When installing new alt, make sure mounting boss to the engine is spotlessly clean. First time even I've seen it be an issue was on Ross's car last summer. Off n on alt not charging, alt overheating, all gone after sanding mounting surface clean (my alt rebuilder gave me the tip).
    Boosted, with alt's reaching such high amps, they simply can't cope with a totally dead battery.
    Battery in trunk, special attention to engine to chassis ground, body ground plus ground at the batt itself.

  5. #5
    Club Supporter bbriann's Avatar
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    My problem was over drive rpm alternator, custom pulley Hopefully fixes it...
    Attached Images Attached Images

    Little 2V 700+ RWHP, Pump Gas
    10.46 sec @ 136 mph

  6. #6
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    When I installed a 130 amp 3g alternator in my 89 years ago I installed an extra 4ga ground wire from the engine to chassis as the factory grounds in this car looked wimpy.
    No alt issues and it's been in a long time.

  7. #7
    Member Frankie's Avatar
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    Quote Originally Posted by bbriann View Post
    My problem was over drive rpm alternator, custom pulley Hopefully fixes it...
    I had to go the other way with my 86.
    With under drive pullies the alt was not being driven fast enough.

  8. #8
    Member maxwell6's Avatar
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    Thanks for all the input. I will go over all connections and clean up all grounds.

  9. #9
    Club Supporter Whitehot's Avatar
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    I had problem overspinning Alt.... Put a bigger pulley on and all good. My alt guy in Brantford said he s modified them before... Took apart NEW Alt and beefed up the armatures . They didn t like high RPM, he did that also .... been great ever since....

  10. #10
    Member maxwell6's Avatar
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    Thanks Whitehot I will definitely swap out the pulley.

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