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Alternator question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by bajaviking, Apr 8, 2003.

  1. bajaviking

    bajaviking 1/2 ton status

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    Last Sunday I was using my winch and almost drained the battery. On the way back from the wheeling spot I noticed that the amp gauge was reading 15~16 amps on the freeway and 13 when in idle, before this it would read only 13 amps pretty much all the time. First I thought it was because the battery had been drained and it was recharging but all day yesterday and also today it was the same, I don't think it should continue recharging after 3 days. Any Suggestions? /forums/images/graemlins/confused.gif
     
  2. bajaviking

    bajaviking 1/2 ton status

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    There must be somebody that knows /forums/images/graemlins/confused.gif
     
  3. dremu

    dremu Officious Thread Derailer Premium Member

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    Umm, do you mean the voltage gauge reading 13 to 16 volts?
     
  4. 70~K5

    70~K5 1/2 ton status

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    If it's reading 15-16 volts you may have screwed up the altenator.
     
  5. bajaviking

    bajaviking 1/2 ton status

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    Yeah, the voltage meter reads 15, before it used to read only 13.
     
  6. 87sm465np208

    87sm465np208 1/2 ton status

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    CHECK YOUR FUSE!, i had a similer problem, and i ripped out the alternator, rebuilt it on my kitchen table, same thing, took it back out, check it again, put it back in same thing, went to autozone got a rebuild alternator, SAME THING, wait, did i check the fuse, fuse was blown, i call autozone right away, got my old alternator back, and money, BTW rebuild kits are cheaper then alternators /forums/images/graemlins/thumb.gif.

    /forums/images/graemlins/usaflag.gif /forums/images/graemlins/truck.gif
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    Don't trust the gauges with your life.

    Put a voltmeter on the battery while its idling. If the alternator is truly putting out more than about 14.5V, you've got a problem.
     
  8. bajaviking

    bajaviking 1/2 ton status

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    Just checked it with the voltmeter, it reads 14.7 at idle and 16.5 when revving the engine. Smells like repair time. Thanks for the comments guys.
     
  9. Z3PR

    Z3PR Banned

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    Rebuilds your Alternator yourself, it really easy to do. Or if you're going to take it to a shop, have them build it into a high amp unit. It's always nice too have a 100+ amp unit if you've got a winch, off road lights, ... ect.
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    I agree. If your stock one was working ok for you, rebuild it. Whopping $15-20 kit at chain auto stores.
     
  11. 87sm465np208

    87sm465np208 1/2 ton status

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    And, those rebuild kits work great too, nuthin like being a do-it-yourselfer /forums/images/graemlins/thumb.gif

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