sc bouncing speedo

[landrover88]

Hello all

Did a search on bouncing speedo did see bouncing tach voltage reg issue think it may be the same for speedo or just bad ground

thanks
dave

[landrover88]

Hello all

new info on my bouncing speedo.

last drive it was a bit normal but then it started going to 0 when i lift from the throttle.

tach seems fine.


have a nice weekend I going for a ride

landrover88

[toddu]

Maybe make sure the sensor "puck" is seated correctly on the transmission, and that the connections in the tunnel where the shift coupler is is not loose.

Todd

[landrover88]

thanks todd

did i mention that it starts after car is hot


dave

[kerthunk]

Odd that it only happens after the engine is hot.

On the transmission side, it is just 8 magnets stuck on a wheel inside the transmission with a puck with a leaf switch inside it. As the magnets pass the leaf switch, it sends a pulse to the speedo. Pretty mechanically reliable unless one of the magnets fall off, but this shouldn't make the speedo bounce only when hot. Make sure that the puck is seated well. You can test by connecting a continuity tester to the end of the leads and counting the number of beeps that occur during a full rotation of the wheels (you need to spin both wheels forward at the same time which makes this task a little tricky).

There are a couple of connections that you want to make sure are tight. The main ones are just under the cover where the shift coupler is.

I would probably just start at the speedo itself. The simplest thing would be to find a Pelican nearby you that has an extra speedo sitting around (you should probably add your location to your profile so that local folks can offer to help you). Plug in the new speedo and see if it bounces and/or plug yours into their car to make sure it works. It will at least tell you that your speedo is good or not and wether you just need to send it off to be repaired.