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Thread: 300 Tdi Erratic Tachometer

  1. 21st July 2016, 06:44 PM #1
    WillsTdi
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    300 Tdi Erratic Tachometer

    G'day All,
    Lately the tachometer in my 97 300 Tdi Disco is not reading correctly. The needle bounces around a lot for a while then behaves normally before getting the jitters again. Happens at all revs. Is this an easy diagnosis? Should I just ignore it? My Disco is an auto so the rev counter isn't a necessity. Cheers William 😎
    Cheers William
    '98 Discovery Tdi SE7 *SOLD*
    '05 BMW R1150 GS Adventure
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  2. 21st July 2016, 06:48 PM #2
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    Homestar
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    The tacho is driven from your alternator - from the 'W' terminal on the back of it to be precise. Check to see if this connection is loose or if your alternator is functioning correctly.

    You could be getting an early warning of an imminent failure.
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
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  3. 21st July 2016, 06:49 PM #3
    sheerluck Guest
    The connection is on the back of the alternator. Check the connector for tightness and breaks.
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  4. 21st July 2016, 06:50 PM #4
    sheerluck Guest
    Gav beat me by 30 seconds.
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  5. 21st July 2016, 06:50 PM #5
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    justinc
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    The W Terminal on the back of the alternator is the tachometer feed. The plug needs to be crimped a little to ensure a good connection. The only other reason for this is when the alternator is on the way to failing but try the wire repair first.

    Jc
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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  6. 21st July 2016, 06:51 PM #6
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    justinc
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    Aaargh you ALL beat me!!😅
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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  7. 21st July 2016, 06:54 PM #7
    WillsTdi
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    Thanks for the lightning fast responses! I'll check the W terminal on the alternator on Saturday 😎 Hopefully it's just a crook connection 😨
    Cheers William
    '98 Discovery Tdi SE7 *SOLD*
    '05 BMW R1150 GS Adventure
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  8. 21st July 2016, 06:58 PM #8
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    Homestar
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    I've got fat fingers - I mean fast fingers...

    Maybe both...
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
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  9. 21st July 2016, 06:59 PM #9
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    justinc
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    Quote Originally Posted by Homestar View Post
    I've got fat fingers - I mean fast fingers...

    Maybe both...
    ...and mine are sllooooowwww 😅
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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  10. 21st July 2016, 07:02 PM #10
    WillsTdi
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    I have a voltmeter fitted that reads the starting battery voltage continuously and it mostly sits at about 13.9 volts. Drops to 13.5 with lights, wipers and air con on. Does that sound OK?😔
    Cheers William
    '98 Discovery Tdi SE7 *SOLD*
    '05 BMW R1150 GS Adventure
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