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Low Voltage

This is a discussion on Low Voltage within the General Help forums, part of the LSx Technical Help Section category; I started my car this morning and the voltage gauge was laying right on the edge of the red. After ...

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    Low Voltage

    I started my car this morning and the voltage gauge was laying right on the edge of the red. After I drove for about 20 minutes the meter went up to the halfway mark then it dropped back down to halfway between 13 and the red. My first thought was my alternator is going bad. My Optima battery is about 2 years old in it. Any thoughts?

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    Moderator 35th-ANV-SS's Avatar
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    I would first check to make sure that all your wiring is connected securely; at the battery and alternator. Make sure all the connections are clean and free of corrosion build up.

    If that all checks OK, I would have both the battery checked and the alternator.

    If you charge your battery with a charger and in a few days the battery is dead again, you either have a faulty cell in the battery or you have something draining the battery; bad fuse, power usage, etc.

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    None Shall Pass Knight's Avatar
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    Agree wih Jon.

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    Spaz is My Mentor SMWS6TA's Avatar
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    make that +2 with Jon

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    Moderator Cutlass's Avatar
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    Quote Originally Posted by adamz02ss View Post
    I started my car this morning and the voltage gauge was laying right on the edge of the red. After I drove for about 20 minutes the meter went up to the halfway mark then it dropped back down to halfway between 13 and the red. My first thought was my alternator is going bad. My Optima battery is about 2 years old in it. Any thoughts?
    Mine did the exact same thing last year before the alternator completely went out. A new alternator fixed my car.

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    Im having a similar problem with my car. Any ideas on why my alternator willnot charge my battery? Ive been to three shops my back is against the wall, Ive replaced the car with a brand new computer, alternator, and battery yet my car will not charge!!! Any Ideas would be greatly appreciated

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    O U 8 1 2 Spaz's Avatar
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    check the battery terminals for corrosion... also check to make sure you're not leaking power steering fluid on the alternator (our cars are imfamous for that)... i've got bad batches of new alternators before...

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    battery terminals are good .. Whats the power steering fluid on the alternator? Where is that located?

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    will that cause the alternator to burn up?

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    O U 8 1 2 Spaz's Avatar
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    Quote Originally Posted by Vettekiller24 View Post
    will that cause the alternator to burn up?
    the power steering pump is located right above the alternator... the seal around the reservouir is notorious for leaking and dripping on the alternator...

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    ok thanks checked it seal is good and nothing is on the alternator. Its like the pcm isnt sending a signal to the alternator. What will cause this its a brand new pcm. And what should the volts read between the pcm to the alternator ?

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    Turns out I had a bad alternator. Put one on yesterday and car is running great

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    Electrical Engineer KMdef9's Avatar
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    Quote Originally Posted by adamz02ss View Post
    Turns out I had a bad alternator. Put one on yesterday and car is running great
    Did you go with a re-manufactured one? If so, I hope you got a lifetime warranty with it.

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    ok I have fixed the PCM and the alternator. The red wire that goes to the alternator was actually broke inside the wire. Everyone who is having this problem check that damn red wire extremly well before taking it to the shop! Its about 30 dollar to fix. Thanks for all the help guys.

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    No I got a new one. No remanufactured parts on my SS!

  16. #16
    Electrical Engineer KMdef9's Avatar
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    Quote Originally Posted by adamz02ss:2723712
    No I got a new one. No remanufactured parts on my SS!
    Smart man!
    "Some people live for the rules..... I live for exceptions" N. Hexum

  17. #17
    infantryman tingo99's Avatar
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    i have a problem with it charges then it the meter goes way low then there is a click and it starts charging.. but then it randomly starts going down randomley.. i have gone thru all the checks lost!! any input would be great

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