tolerate Posted May 1, 2014 Share Posted May 1, 2014 Hey Guys, I've been researching as to why my speedo needle isn't moving. I figured that it could be a cable problem, but shouldn't the odometer not work either? i'm talking the trip odometer. Quote Link to comment Share on other sites More sharing options...
BLOZ UP Posted May 2, 2014 Share Posted May 2, 2014 (edited) What year/car? Our Z32TT had that issue, the PCB had some solder flux residue that caused a short. Edited May 2, 2014 by BLOZ UP Quote Link to comment Share on other sites More sharing options...
tolerate Posted May 2, 2014 Author Share Posted May 2, 2014 1977 280z. I will visually inspect the speedo cable this weekend if I have time. I've got dry rot on the tires and need to get those replaced asap. just to reiterate my problem, my speedo needle isn't moving, but my trip odometer is turning. Quote Link to comment Share on other sites More sharing options...
cgsheen Posted May 2, 2014 Share Posted May 2, 2014 The needle is attached to a shaft that is attached to a steel cup that rides in close proximity to a magnet that is spun by the cable. (when the magnet spins, it acts on the metal cup causing it to spin even though there is no direct connection) Open the speedo and you'll see. The needle won't turn if the shaft or cup is buggered up. The Odometer is run by gears that are driven by the cable, The cable, Odo gears, and the magnet can all turn without the needle moving. Or the magnet may not be spinning... Quote Link to comment Share on other sites More sharing options...
NewZed Posted May 2, 2014 Share Posted May 2, 2014 (edited) The trip meter shows that the cable is turning. The older speedometers use a rotating magnet, and a cup or disc shaped thing, and a spring to show speed. There's pictures out there is you search "how a speedometer works". You probably have a spider web or some sort of crud in the mechanism, its kind of sensitive. You could try to spin it free by driving really fast or use a drill motor on the cable end, or take it out out and see if you can break things loose by shaking it. Or take it apart and see if it's cleanable. There's a nice picture in this link - http://www.uniquecarsandparts.com.au/how_it_works_speedo.htm Edited May 2, 2014 by NewZed Quote Link to comment Share on other sites More sharing options...
tolerate Posted May 2, 2014 Author Share Posted May 2, 2014 thanks guys I'll try driving fast first :] Quote Link to comment Share on other sites More sharing options...
NewZed Posted May 2, 2014 Share Posted May 2, 2014 Without exceeding the speed limit, of course.... Drive at your own risk. Quote Link to comment Share on other sites More sharing options...
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