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Thread: intermitant voltage spiking

  1. 3rd August 2009, 10:29 PM #1
    andrew e
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    intermitant voltage spiking

    Every now and then my dash voltage gauge flicks upto 16v and the battery warning light flickers on. I have checked all connections on battery leads, earth straps, isolators etc, and nothings loose. Checked alternator brushes, still good, and spring is good aswell. The regulator looks almost new, and the contacts on the relay are clean. A new regulator is only about $40, so i am getting another anyway to see. Is there anything i am missing or should be checking aswell?

    Andy
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  2. 4th August 2009, 04:51 AM #2
    Dougal
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    Stick a multimeter into the cigarette lighter socket and go for a drive. Just to confirm your voltmeter isn't having a bad day.
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  3. 4th August 2009, 09:26 AM #3
    andrew e
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    Quote Originally Posted by Dougal View Post
    Stick a multimeter into the cigarette lighter socket and go for a drive. Just to confirm your voltmeter isn't having a bad day.
    Sorry i forgot bto mention, i have 2 voltmeters, the factory one, and one with incraments. They are both spiking.

    Its funny, it didnt do it today. Mabe one of the brushes was sticky and it loosened up when i checked it.

    Andy
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  4. 4th August 2009, 09:27 AM #4
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    Nick S
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    Andrew, had the same thing in my 90 RRC a few years back. The fault was the regulator.
    Cheers
    Nick
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  5. 4th August 2009, 11:35 AM #5
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    rovercare
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    Reg. is playing up, it's what regulates the voltage, the spikeing indicates its having a rover moment
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  6. 4th August 2009, 07:59 PM #6
    andrew e
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    yesss, but its NOT a lucas regulator, its a hitachi.

    Andy
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  7. 4th August 2009, 08:10 PM #7
    Blknight.aus's Avatar
    Blknight.aus
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    doesnt mean it cant have a bad earth.

    bad earth lowers the voltage the reg sees so it ups the volts till it sees the voltage it likes.

    when the new higher voltage breaks over the bad earth and it comes good it realises its made a mistake so drops back down.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

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  8. 4th August 2009, 08:32 PM #8
    andrew e
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    Quote Originally Posted by Blknight.aus View Post
    doesnt mean it cant have a bad earth.

    bad earth lowers the voltage the reg sees so it ups the volts till it sees the voltage it likes.

    when the new higher voltage breaks over the bad earth and it comes good it realises its made a mistake so drops back down.
    I double checked the earth cables between the battery/chassis and transfer, all were tight.

    Or are you refering to the earthing of the regulator itself?

    Andy
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  9. 4th August 2009, 09:04 PM #9
    Blknight.aus's Avatar
    Blknight.aus
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    the regulator itself.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
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  10. 8th August 2009, 02:39 AM #10
    Albert
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    I had the same problem a few years ago. Replaced the reg and it was still the same.
    Auto sparky spent two hours and found one of the two wires that go to the battery in the loom that the reg plugs into was broken.
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