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Speedometer drops to zero

Discussion in 'Chevy Trucks' started by 81c1500, Oct 19, 2004.

  1. 81c1500

    81c1500 Junior Member
    Messages: 29

    :dizzy:

    I have an 89 c1500 4x2 short bed with a 305. Every once and awhile the speedo drops to zero. I tap the the front of the gauge and it returns to the current speed. Has anyone had to modify either the plug on the circuit board for the speedometer or the connector in the dash to correct. Thanks
     
  2. JKOOPERS

    JKOOPERS Senior Member
    Messages: 112

    sounds like to me that you need to replace the speedometer cable that goes to the tranny. what happens is that the gear gets worn out
     
  3. TLS

    TLS PlowSite.com Addict
    Messages: 1,425

    It needs a new instrument cluster.

    Not really all that expensive. I had my local GMC garage do it about 5 years ago on my '90.
     
  4. lawnmedic

    lawnmedic Senior Member
    Messages: 703

    No cable on the 89 and newer models... Check the connection on back of cluster, also check ground wires....
     
  5. wfd44

    wfd44 Senior Member
    from Maine
    Messages: 369

    Could be the VSS too. But, if it comes back to life with some gentle persuasion to the front of the cluster it is probably either th cluster or the connection.

    Pull the cluster out check to make sure the connections at the back are clean and tight. If the problem persists or goes away for awhile then comes back it is probably the cluster.
     
  6. TLS

    TLS PlowSite.com Addict
    Messages: 1,425

    88-Ninety?'s(whenever they changed dashs' 94?) were notorious for this, and there are plenty of reman IC's in dealer stock for this reason. Mine would trigger my brake warning light, as it must have something to do with the speed sensor for the RWAL brake system.

    And yes, I spent a year banging on the top of the dashboard for quick fixes!