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Thread: All gauges malfunctioning 300tdi auto.

  1. 6th December 2024, 02:19 PM #1
    edddo's Avatar
    edddo
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    All gauges malfunctioning 300tdi auto.

    New purchase.
    A neglected 98 300tdi auto.
    240k on the clock.
    Fuel guage works for a while sometimes and then shows empty. Other times it shows incorrectly, too high.
    Tacho goes haywire when headlights are on.
    Temperature gauge works well for a while then shows cold.
    What is the best way to approach this?
    I have read about aging fuel tank senders.
    I have a new temperature sender.


    thanks
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  2. 6th December 2024, 03:01 PM #2
    AK83
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    most likely the printed circuit board on the back of the cluster.
    I'd say look for ground connection loosesness.
    IIRC there is a large connector on the back, check that too.
    Arthur.

    All these discos are giving me a heart attack!

    '99 D1 300Tdi Auto ( now sold :( )
    '03 D2 Td5 Auto
    '03 D2a Td5 Auto
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  3. 10th January 2025, 10:36 PM #3
    ChrisMF135
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    I would add to what AK83 has added to say use some contact cleaner on the connections, such as the big connector on the back of the instrument cluster. With the ground connector it is also possible corrosion has a part to play and it needs cleaning up. My Discos are 96 and 98 and often with intermittant electrical problems it is the contacts. Just comes with the age of the vehicules.

    Chris
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  4. 10th January 2025, 10:52 PM #4
    Tins's Avatar
    Tins
    Tins is offline LordRover Subscriber
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    Another vote for the cluster PCB. Hardest part of the job imo is getting the binnacle off and on without breaking it. They didn't like the Aussie sun.
    ​JayTee

    Nullus Anxietus

    Cancer is gender blind.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
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