Electrical Problem

Discussion in 'Technical' started by KilE, Oct 25, 2013.

  1. KilE

    KilE Keepin it going'

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    Hello,

    I just bought my first 1989 Nissan 300ZX Z32 from a private seller today, Without Rego or a Road worthy cert and was given a 'failed' Road worthy cert, so I would know what is needed to be done.

    Main concern is, that the Speedometer and Tachometer both work but do not show the correct speed and RPM.
    What could be the cause of this problem?

    Once running, the speedo stays on 60 no matter what speed, and tacho stays on 2 no matter what.

    Please help
     
    KilE, Oct 25, 2013
    #1
  2. Sanouske

    Sanouske Retired Moderator

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    I would double check the connections at the back of the cluster. There can be problems with the soldered joints at which some may require attention.

    Further to this I would check the speed sensor in the gearbox. They can fail and sometimes are a simple fix or a complete replacement. Have a bit of a search regarding this as there are a few how to's.

    Does your steering feel firm all the time or intermittently going soft and hard?

    If you got a fail due to a non working cluster but nothing else that's pretty good :)
     
    Sanouske, Oct 25, 2013
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  3. KilE

    KilE Keepin it going'

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    Felt firm, I will check the back of the cluster thanks and speed sensor in the gearbox :)
     
    KilE, Oct 25, 2013
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  4. Justus

    Justus Member

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    From experience in older cars xf fords and such a simple bad connection can result in a stable reading. Ie: 60km/h and 2000rpm. Does it go upto 60 from 0 or just straight to 60 with powering up.

    Sorry if it's no help like I said it was a few fords that did it.
    I guess the speedo sensor is a good start but doesn't explain the rpm.
    Tampered cluster someone tried to wind back also.
     
    Justus, Oct 25, 2013
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  5. aazn

    aazn New Member

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    I'm in keysborough if you want to swing by mine i have 2 working clusters you can plug in and check.
     
    aazn, Oct 25, 2013
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  6. KilE

    KilE Keepin it going'

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    It goes up to 60 while the engine is running, and also 2 RPM -3 RPM while running, when engine is not running, both are at 0.

    Simple bad electrical connections are usually the cause for older vehicles, as my 86' volvo had a bit of that but I have read else where that if the Speedo doesn't work than the Tacho shouldn't either
     
    KilE, Oct 26, 2013
    #6
  7. ZDUCTIV

    ZDUCTIV Active Member

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    You can have one working without the other.

    Definitely try a full cluster swap with one that is known working. Fastest way to track it down.
     
    ZDUCTIV, Oct 26, 2013
    #7
  8. jschrauwen

    jschrauwen My Fairlady Z

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    jschrauwen, Oct 26, 2013
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