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Thread: Alternator Voltage Questions ?

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    Default Alternator Voltage Questions ?

    My battery died while driving recently I traced the problem to a stuffed alternator It was only putting out 12.1 volts and dropping to 11.3 volts going by the digital dash display ,So I swapped the internals from a VT alternator 100 amp into the VS l67 casing Now its reading
    13.8-14.1 volts while driving ,
    13.3 with aircon & lights driving
    13.8-13.9 @ idle in park
    13.1-13.2 @ idle in park aircon &ligths

    And the readings at the battery At idle are
    14.93 @ idle
    13.97 @ idle aircon and lights

    Does this sound right? Ive searched the forums and get a different answer everytime

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    Sounds spot on to me
    If you don`t want to break it , then don`t bring it out to play with it !

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    wamboin23 is offline Donating Member w/ Boost
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    Quote Originally Posted by vsl67 View Post
    My battery died while driving recently I traced the problem to a stuffed alternator It was only putting out 12.1 volts and dropping to 11.3 volts going by the digital dash display ,So I swapped the internals from a VT alternator 100 amp into the VS l67 casing Now its reading
    13.8-14.1 volts while driving ,
    13.3 with aircon & lights driving
    13.8-13.9 @ idle in park
    13.1-13.2 @ idle in park aircon &ligths

    And the readings at the battery At idle are
    14.93 @ idle
    13.97 @ idle aircon and lights

    Does this sound right? Ive searched the forums and get a different answer everytime
    are the first readings off the dash, or the back of the alternator?

    14.93v at idle is a bit high. i'd check that the sense wire at the battery (small red link going into a black connector) is attached and all good.

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    The 14.93Vdc @ idle looks high to me....my limited experience and diminishing brain cells make me think it should be 14.2Vdc - was that measures at the alternator or at the battery?
    "If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
    "The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux

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    The top readings are the dash displays and the last 2 readings are at the battery Terminals Just just rechecked the 14.93 at Idle looks like I made a typo its actually 14.23volts

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    Sounds a bit better!...volts at idle with lights and A/C on seem the wrong way around to me as when driving should be higher than at idle - is the one when driving done with the dash display and the one at idle with a multimeter?....
    "If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
    "The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux

  7. #7
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    Yer thats right Driving using Dash display 13.8-14-1 and the 14.23 at idle at the battery with a multimeter

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    good quality multimeter or just a cheapie?
    unless it's something like a fluke use it as a guide they vary a lot in accuracy and most show a higher voltage as the internal battery gets flatter.
    the dash readouts are usually pretty spot on, try a fresh 9 volt battery in the dmm and recheck the high reading you posted.
    anything from 13.8-14.4 is the normal for an alternator at idle or just above idle as a base line with no load, turn things on and it'll drop as you've discovered and you'll probably start to hear it whine as it's loaded up more. all in all looks like it's working fine.
    Last edited by Jxfwsf; 14-01-2012 at 10:57 PM.

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    While were here kicking the can around about this electricity thingymajigger,

    how's your charge wire?

    Now, would be a good time to rebuild it if you haven't already.


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