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Thread: alternator/ voltmeter problem?

  1. #1
    Member JUNIOR BUILDER
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    alternator/ voltmeter problem?

    Last night i was driving around in my truck, and noticed the voltmeter was down at 9 instead of 12 and the batter light was on. that was at sitting at a stopsign, then about a mile down the road going 45 mph i saw the light go off and the gauge was sitting just a hair above 9 .when i went to start the truck this morning it started fine but the gauge still sat down in the red at 9. I'm only 17 and still learning so i don't know hardly anything about the charging system yet, so i need some help diagonsing the problem.

  2. #2
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    Check or have someone check the alternator to make sure it's putting out and while you're at it load test the battery to make sure it's ok. Most Auto Zone's, O'reilly's Napas, etc will do this for you at no charge.

  3. #3
    Senior Member RACING JUNKIE
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    If you have a volt meter, check the voltage on the battery itself while it is running. This will tell you if the alt is putting out. Dont drive to far before checking it, hate to see ya get stuck somewhere.
    David Lanning
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  4. #4
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    Said he was on 17 and didn't know what to do. I figured he didn't have a volt meter or someone to help. If he had a volt meter he would have asked how to use it. Not being a smart azz that's just what I was thinking.

  5. #5
    Member JUNIOR BUILDER
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    Well i just went out on a quick errand to walmart, about 3 miles away, when i left it was sitting at 9 still with the light on, by the time i got there tho the light was off and it was back to normal level.

  6. #6
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    Quote Originally Posted by laxking012
    Well i just went out on a quick errand to walmart, about 3 miles away, when i left it was sitting at 9 still with the light on, by the time i got there tho the light was off and it was back to normal level.
    It didn't come on for nothing. Have it checked before it leaves you stranded in the middle of BFE.

  7. #7
    Member JUNIOR BUILDER
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    yeah theres a napa just down the street so i'll take it there when they open back up, they're closed today.

  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by TheRabbit
    Said he was on 17 and didn't know what to do. I figured he didn't have a volt meter or someone to help. If he had a volt meter he would have asked how to use it. Not being a smart azz that's just what I was thinking.
    I think that says he is 17 not on 17

    A multi meter is cheap and is a must for everyones tool box. Walmart has one also if ya go there again. I think they are around $10.00 if ya go get one and cant figure it out, pm me and I'll me more then happy to explain over the phone. And you should learn these things for later on down the road anyways :lol:
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
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    Lanning Electric
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    APD Race Engines
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  9. #9
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    I hate spelling errorss! ops:
    I agree a multi meter is must have. I had a Fluke 77 that lasted probably 20 years, but died last year. Bought a Snap On, liked the fluke a little better.
    Also a decent battery load tester too. At 17 I was more interested in gas money than a multi meter though. lol

  10. #10
    Member JUNIOR BUILDER
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    Haha yeah all my money goes to gas and insurance. Tho christmas is only a month away....


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