VDO voltmeter reads 1.5 volts too high. Adjustable?

Electrical & Ignition

  1. themechanic

    themechanic Oklahoma is OK FBBO Gold Member

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    I have a VDO 332-103 Vision Voltmeter that reads 1.5 volts too high. This has been verified by measuring voltage at the battery. I also took the alternator out and had it bench tested at an alternator repair shop.

    Is there any way to calibrate the gauge or adjust it to read accurately?

    Thanks FBBO
     
  2. Sam69sat

    Sam69sat Well-Known Member

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    Have you tried testing the voltage at the leads on the back of the guage with a multimeter just to make sure something weird isn't going on?

    If there's not a way to calibrate it i wonder if you could use a voltage divider using two resistors and drop it just enough to make it read correctly? Just an idea, not even sure if it would work or if there's any danger.
     
  3. MoparLeo

    MoparLeo NRA BENEFACTOR LEVEL LIFE MEMBER FBBO Gold Member

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    Have you tried to contact VDO directly ? They have a list if distributors on their website and I am sure they can help you with your situation.
     
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    • RemCharger

      RemCharger Well-Known Member

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      You've tried a new battery?
       
    • themechanic

      themechanic Oklahoma is OK FBBO Gold Member

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      Thanks guys. I left a message for VDO customer support and they told me there is an adjustment attenuator on the side of the gauge, which is covered by the long plastic nut that retains the gauge in the bracket. I used a multimeter at the battery to verify the charging voltage and turned the attenuator to match. It's adjusted and reading correctly now.
       
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