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Thread: Voltage Stabalizer and Fuel Gauge Readings

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  1. #1
    Obi Wan
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    Voltage Stabalizer and Fuel Gauge Readings

    I installed a TR4A voltmeter in my TR3 when I converted to an alternator. I put a new voltage stabilizer in line in front of the fuel gauge to lower the voltage to 10 volts as required. The gauge works but the dial will only read a little before the half way mark when the tank is full? Is this an issue with the stabilizer or does the tank sending unit float arm need to be bent? The sending unit float is centralized and not hitting the sides.

  2. #2
    Great Pumpkin NutmegCT's Avatar
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    Re: Voltage Stabalizer and Fuel Gauge Readings

    Karl - I'm no expert at all, but if your TR has an alternator, why do you need a voltage stabilizer?

    Thanks.
    Tom M.
    Mac & Phyllis Take a Trip: http://nutmegflyer.com/trip-details-daily-updates/
    History: 1976 MGB, 1959 Triumph TR3A, 1960 Mercedes-Benz 190b, 1958 Rambler American.
    Current: 1953 MG TD27318.

  3. #3
    Obi Wan
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    Re: Voltage Stabalizer and Fuel Gauge Readings

    Quote Originally Posted by NutmegCT View Post
    Karl - I'm no expert at all, but if your TR has an alternator, why do you need a voltage stabilizer?

    Thanks.
    Tom M.
    To lower the voltage from 12 to 10 volts for the fuel gauge.
    Karl

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    Obi Wan Sarastro's Avatar
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    Re: Voltage Stabalizer and Fuel Gauge Readings

    Is it a modern replacement stabilizer or an original-type stabilizer? If it's a modern one, the problem is almost certainly in the fuel gauge. If it's the older type, it could be either.

    The modern stabilizers give you a constant 10V. The original ones turned on and off periodically, with the expectation that the average output voltage would be more or less sorta like maybe approximately 10V, maybe. The gauges were so slow to respond that it didn't matter much. But if the stabilizer failed, pretty much anything could happen.

    The most common failure mode for the modern ones is that the input fuses to the output, so you get whatever the system voltage is, 12-14V; occasionally, when totally zapped, the output is zero. So, you'll get either a high reading on the gauge or nothing.
    Steve Maas
    1966 Triumph TR4A, undergoing restoration: http://www.nonlintec.com/tr4a
    1952 MG TD, restoration completed 2014, sold 2016: http://www.nonlintec.com/mgtd
    1960 Austin-Healey "Bugeye" Sprite, sold 2010: http://www.nonlintec.com/sprite
    1967 Porsche 912: http://www.nonlintec.com/porsche

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    Yoda dklawson's Avatar
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    Re: Voltage Stabalizer and Fuel Gauge Readings

    Karl, I have three background questions.
    1) Why did you decide to install a new voltage stabilizer?
    2) When did the fuel gauge last read correctly for you?
    3) Assuming the temperature gauge is electric, how is it reading? Is it also reading low?
    Doug L.
    '64 Morris Mini Cooper-S 1275
    '67 Triumph GT6 Mk1

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    Obi Wan
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    Re: Voltage Stabalizer and Fuel Gauge Readings

    Switched out stabilizer . All is good now.

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