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Thread: Erratic rev counter

  1. 25th April 2014, 10:36 AM #1
    Bolton
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    Erratic rev counter

    Hi from Perth to you all. I have recently inherited a 1999 Series 1 Disco 300 TDI. Reliable beast with only 200K on the clock, but she has a few problems. One is that the rev counter works only now and again and swings around a bit wildly when it does. Is this a simple loose wire or similar?

    All help appreciated.

    Cheers
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  2. 25th April 2014, 11:03 AM #2
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    Scouse
    Scouse is offline OldBushie Gold Subscriber
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    The tacho feed is from the alternator so make sure the terminals are nice and tight.
    Scott
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  3. 25th April 2014, 11:05 AM #3
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    bee utey
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    The tacho is driven by a wire off the back of the alternator, the wire is white with a grey stripe on what is known as the "W" terminal. Either the connector is loose or your alternator isn't working as well as it should.
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  4. 25th April 2014, 12:47 PM #4
    superquag
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    Welcome to Our World.

    x2. Most of your electrical problems will be caused by wiring faults, the kind that ex-jap owners have no understanding of... Loose fastenings & corrosion on earth points, barely adequate cable gauge, loose connectors, under-rated switches such as the headlamp beam switch on some... Some major components don't seem to be as long-lived as 'other' brands...

    All are known (eventually) to us masochists and we're as happy to see someone else suffer...and help them out.
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  5. 25th April 2014, 04:51 PM #5
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    87County
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    Welcome to the forum

    If it's still erratic after checking wiring it could be time for a new alternator.

    Not cheap, but simple to replace. Once replaced it should last a good while
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  6. 26th April 2014, 11:59 PM #6
    Bolton
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    Sorted

    Thanks to you all and especially to Bee Utey. Cleaned up W terminal on alternator and rev counter all good.

    Cheers Lads

    Bolton
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