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  • Adjustable voltage regulator 'quirks'

    My 2 year old bosch alternator produced 13.6 to 13.8V at all times -temp, rpm, load etc. This wasn't fully charging my AGM battery, which requires 14.2V for a full charge. So I switched to the adjustable voltage regulator sold here...

    http://www.davebarton.com/AdjustableVoltage.html

    First I had the screw turned the wrong way and I had 12.5 to 12.8V over varying conditions. The next day, I turned the screw the other way. I get 14.0 to 14.25 as long as the RPM is 1200 or greater. But at idle, it drops to 12.5V. Is this normal? Do the brushed need to wear in?

    Thanks,
    Narayan

  • #2
    I"ll chime in. I've never run an adjustable voltage regulator, so I don't have personal experience. I do know that there have been lots of complaints about the stock alternator and low voltage. The stock alternator putting out low voltage at all RPM but especially at low RPM is a common complaint. It seems like the AVR would fix this but I'm suspicious that the stock alternator might not have enough oomph at low RPM to deliver 13/14 volts if there is much of any amperage load. Lots of folks are running a higher amp alternator from BNR to solve this problem. There are several threads mentioning them. One is here:

    http://www.s14.net/forums/showthread...lternator+ebay

    I read somewhere on S14.net that you need to ask BNR to configure the alternator so that the top two case screws will protrude out from the back of the casing so that the the alternator wires can be attached to the casing. You also need to make sure you get the correct pulley diameter. I believe that's a 3.0 inch outer diameter pulley.

    Just to confuse things, here's a thread where someone fixed their voltage with an AVR:

    http://www.s14.net/forums/showthread...de+pulley+amps

    The difference might be that it wasn't purely a stock alternator. Maybe since it was a refurbished alternator it was able to handle the load better.

    ......

    Dang it. I hit post when I meant to hit preview. Here's another BNR thread:
    http://www.s14.net/forums/showthread...ernator-ampage
    Last edited by indie_wannabe; 07-30-2012, 07:32 AM.

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    • #3
      The same alternator with the stock voltage regulator maintains 13.6V at idle with headlights on. Why would the adjustable one let it drop to 12.5V at idle regardless of whether headlights/ radio etc are on or not. It pumps up to 14.2V by 1200rpm.

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      • #4
        Originally posted by Narayan3 View Post
        The same alternator with the stock voltage regulator maintains 13.6V at idle with headlights on. Why would the adjustable one let it drop to 12.5V at idle regardless of whether headlights/ radio etc are on or not. It pumps up to 14.2V by 1200rpm.
        If it's the same alternator and pulley, same engine conditions, and the only thing that's different is the regulator, then it's a problem with (or a "feature" of) the regulator...
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