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Stock Alternator Output

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 84k5, Apr 24, 2001.

  1. 84k5

    84k5 1/2 ton status

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    Anyone know what the stock alternator on a 84 k5 with a 305 puts out at idle? What's max output? Thanks.

    Brian
    <A target="_blank" HREF=http://84k5.coloradok5.com>http://84k5.coloradok5.com</A>
     
  2. Waxer

    Waxer 1/2 ton status Author

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    Roughly 60 amps.
     
  3. 84k5

    84k5 1/2 ton status

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    Is that the max or at idle? I'd like to know both if possible.

    Brian
    <A target="_blank" HREF=http://84k5.coloradok5.com>http://84k5.coloradok5.com</A>
     
  4. Waxer

    Waxer 1/2 ton status Author

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    that would be max, idle I have no idea. You'd have to hook up a multimeter to test it out yourself
     
  5. CaptCrunch

    CaptCrunch 1/2 ton status

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    stock alt should be about 70 to 90 amps... it probabaly only kicks out about 40 or so at idle... as he said you can get more exact numbers w/ a multimeter.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  6. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    And keep in mind all these figures are only accurate if your alternator is in good shape- If the brushes are worn down, you'll get even less.............



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  7. HarryH3

    HarryH3 1 ton status Author

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    Don't hook your multimeter inline with the alternator feed unless you want to watch the meter smoke. Most can't handle more than 10 amps. [​IMG] You need a pretty serious meter to be able to measure the output current of an alternator. A lot of parts stores have a rig they can put your alternator on to test the output voltage and current at various RPM's.

    <font color=black>HarryH3 - '75 K5</font color=black>
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