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    BassAddictJ's Avatar
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    Strange Voltage

    When I start my car my voltmeter hooked into the 12v ignition reads 14.4v for the first few minutes after starting the engine, eventually dropping to 13.8v. The voltage while driving will randomly drop from 13.8v all the way down to 12.5v, then eventually within about 10min later work its way back up to 13.8v over the course of 10-20sec. Only times I see the amp effect the voltage is when playing full tilt. Even then sometimes it'll be sitting at 12.5v, and then i play full tilt and the voltage does not move or go under 12.5v. Then still playing full tilt it will eventually work its way up to 13v. Often when the voltage is at 13.8 i play full tilt and the drop is to right at or around 13v. Although the voltmeter is on the ignition side, it is always within 0.1v if not dead on with readings on the back battery and amp at all playing volumes.

    It's weird to be driving and see the voltage go from 13.8v to 12.5v. Even reving my rpm's has virtually no effect on boosting the voltage when its hovering around 12.5v.

    Stock 120amp alty
    Stock bat is in the trunk, connected to + on alty
    Back battery (d3100) is hooked up to the + on the alty (only connected to front bat at alty + terminal).
    1/0 with big 3, solid chassis ground.

    any thoughts to why this voltage is fluctuating?



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  2. #2
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    Re: Strange Voltage

    anyone?



    Team American Power Systems
    Pioneer Avic N5 Navi + CD-UB100 USB Adapter. RARE Circa 1996 PPI Ax606.2 in BLACK (1 of 400ish made) with 2 rare black graphic spacers.
    CDT DRT-25 1'' Silk Dome Tweeters / CDT ES-04 4'' Midranges / RE Audio XXX 6.5'' 2ohm Neo Mids In Glassed Kick Pods
    American Power Systems 240amp H.O. Alty / (2) Deka 8a31, 1/0 front to back.
    Unknown Prototype 3k @ 1ohm. TRF/PSI 8 layer 4in coil hybrid beast in 3 cubs @ 33Hz / Raammat 40sqft in the trunk.
    Quote Originally Posted by Haunz View Post
    You could put 12V to my balls and clamp my dick to get 3kW+.
    Quote Originally Posted by Slayerx View Post
    Glad this got bumped so I could fap to it again.

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    Re: Strange Voltage

    If it drops voltage with your audio off, then it sounds like you might need to get your alt tested. Could be a problem with the voltage regulator?

    You can rule out your batts by just hooking up one at a time and see if you still get the random voltage drop.




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    Re: Strange Voltage

    is your belt squealing? slipping?



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    Re: Strange Voltage

    its more than likely the voltage regulator in the alt my car did the same thing and thats what was wrong with it im just gonna put a 250a on mine




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    Re: Strange Voltage

    It's likely that when you first turn it on the engine RPM's are slightly higher than at normal idle. So when it finally warms up the voltage drops a tad.



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    Re: Strange Voltage

    new gm cars do this, shut off the alt when the batt doesnt need charging, and its computer controlled, it *****!!!



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    Re: Strange Voltage

    these voltages are with the car on.

    i'll try it with the one bat at a time

    no belt noises.

    yeah the 14.4 at first and then a slight drop i knew was normal....but the later fluctuations i thought were strange. so if it is the fact that the alty is being computer controlled, why is it not seeing that the d3100 is needing a charge? how does this switch work and is there any way for it to recognize the d3100 and be left on?



    Team American Power Systems
    Pioneer Avic N5 Navi + CD-UB100 USB Adapter. RARE Circa 1996 PPI Ax606.2 in BLACK (1 of 400ish made) with 2 rare black graphic spacers.
    CDT DRT-25 1'' Silk Dome Tweeters / CDT ES-04 4'' Midranges / RE Audio XXX 6.5'' 2ohm Neo Mids In Glassed Kick Pods
    American Power Systems 240amp H.O. Alty / (2) Deka 8a31, 1/0 front to back.
    Unknown Prototype 3k @ 1ohm. TRF/PSI 8 layer 4in coil hybrid beast in 3 cubs @ 33Hz / Raammat 40sqft in the trunk.
    Quote Originally Posted by Haunz View Post
    You could put 12V to my balls and clamp my dick to get 3kW+.
    Quote Originally Posted by Slayerx View Post
    Glad this got bumped so I could fap to it again.

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