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Thread: VOLTS DROP WHILE DRIVING

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  1. 03-22-2007, 06:32 PM #1
    alexvr
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    VOLTS DROP WHILE DRIVING

    this has been going on for a while now, it started with the car not starting so i changed the battery n it was fine for 2 weeks then it gave me problems again so i got the alternator changed. it was also making a whining noise. once i got the new alternator the noise stoped but started again a weeek later and i notice my volts droping from 13 to 11.8 while driving...what can it be bad alternator? i got another batt only this time a yellow top...anyone know?
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  2. 03-22-2007, 07:05 PM #2
    ericbla03
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    alternator belt maybe??

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  3. 03-23-2007, 09:32 PM #3
    dronesurfboards
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    Do you have a system in your car? if you do, and you play your music loud, then, thats probably the issue. my system used to drop my voltage down to the 11's until i put a capacitor. If thats not the case, then its probably what ericbla03 said, belt slippage or bad ground wire.
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  4. 03-25-2007, 11:56 PM #4
    alexvr
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    no i disconnected it and it was only a 300 jbl with a t1 10" and it still did it, i havent gotten the chnce to take it but its either the belt or alternator...how do i find a bad ground wire?
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  5. 03-26-2007, 12:45 AM #5
    dronesurfboards
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    battery ground wire. mine went bad...thought it was my alternator, i replaced it and i was back to normal
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  6. 03-26-2007, 09:55 AM #6
    Jeffylou87
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    You could tell if your alty is bad... It should scream at you... Mine went through a whole lot of noise before it pooped...
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  7. 03-27-2007, 09:14 PM #7
    01blackG
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    Make sure the belt is tight but not to tight. Either loose or to tight can cause the alt. to do goofy things and not work right. I highly dought its a nother bad alt. but to make sure just take it up to the parts store and have them test it.
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  8. 03-27-2007, 09:44 PM #8
    alexvr
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    i did that the first time n they said it was good when it was really bad, ill take it to another one tho thanks ill keep updated
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  9. 03-28-2007, 03:13 AM #9
    mindwerkz
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    Quote Originally Posted by dronesurfboards
    battery ground wire. mine went bad...thought it was my alternator, i replaced it and i was back to normal
    x2 with the addition of an Optima Bluetop.
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  10. 03-28-2007, 10:45 AM #10
    G-spot
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    Quote Originally Posted by mindwerkz
    Quote Originally Posted by dronesurfboards
    battery ground wire. mine went bad...thought it was my alternator, i replaced it and i was back to normal
    x2 with the addition of an Optima Bluetop.
    Blue top? Marine battery?
    That happened to me a month ago the solder connecting to the battery ground melted and I just replaced my alternator a month before that.
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  11. 03-28-2007, 06:19 PM #11
    mindwerkz
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    Quote Originally Posted by G-spot
    Quote Originally Posted by mindwerkz
    Quote Originally Posted by dronesurfboards
    battery ground wire. mine went bad...thought it was my alternator, i replaced it and i was back to normal
    x2 with the addition of an Optima Bluetop.
    Blue top? Marine battery?
    That happened to me a month ago the solder connecting to the battery ground melted and I just replaced my alternator a month before that.
    Oh I just meant that I too thought I had a bad alternator but I replaced the ground wires and upgraded to the blue top and my problem was solved.

    EDIT - wait, are you saying the marine battery is going to start melting my connections? did you have an OEM alternator or something heartier?
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