New speedo cable, no speed…

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s8ndst0rm

s8ndst0rm

Active Member
Posts
90
I have purchased a new Speedo cable due to the old one having a snapped plastic clip and the Speedo needle bouncing around.

The new cable however, when installed, doesn’t move the needle at all.

Removing the Speedo, I can see the thing spinning so my connection into the gearbox is sound.

Could I have the wrong cable? Need a new connector on the back of the Speedo itself?
 

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The white clip on the end of the cable are poor, is it secure when attached to the speedo. The needle does tend to bounce around especially at lower speeds.
 
Anaconda said:
The white clip on the end of the cable are poor, is it secure when attached to the speedo. The needle does tend to bounce around especially at lower speeds.
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Yes, it clicks in nicely when attached to the Speedo clock but the needle never moves.

I’ve also tried spinning the cable with a drill from the other end and the Speedo doesn’t move
 
I’ve fitted a new cable before and the needle didn’t move. Had to take the cable off the back of speedo and put it back on but push the cable further in to the head with bent needle nosed pliers, then clip outer cable on. It was a fiddle but eventually got the needle moving
 
Def90man said:
I’ve fitted a new cable before and the needle didn’t move. Had to take the cable off the back of speedo and put it back on but push the cable further in to the head with bent needle nosed pliers, then clip outer cable on. It was a fiddle but eventually got the needle moving
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I can’t pull the cable out enough because of the other end which has a stopper type thing. Maybe that can be moved or removed?
 
Maybe the old one was not the original one. I had Speedo cable that was made of two parts a short from the speedometer. Check with the parts book for left and right hand drive.
 
The bouncing of the speedo is due to the cable not moving at a constant speed. The speedo cable is a twisted cable and can act like a spring, as it bends around in the outer sheath you can get tight spots, resistance or binding. Not enough to make the speedo cable not work but just enough to give a jerky final drive rather than smooth. Some very light oil down the cable can improve things, but it is just a symptom of the style of speedo cable and the quality of the parts. It is the amount of bounce you need to be worried about not the fact that is it bouncing.
 
dag019 said:
The bouncing of the speedo is due to the cable not moving at a constant speed. The speedo cable is a twisted cable and can act like a spring, as it bends around in the outer sheath you can get tight spots, resistance or binding. Not enough to make the speedo cable not work but just enough to give a jerky final drive rather than smooth. Some very light oil down the cable can improve things, but it is just a symptom of the style of speedo cable and the quality of the parts. It is the amount of bounce you need to be worried about not the fact that is it bouncing.
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Great info, thanks!
 
Trying to do some more research into this, I’ve come across this image showing the same model of cable I have - PRC6022

The Speedo end of the cable in this photo comes out further than the end of the white plastic connector, but the cable I have it sits inside it about half an inch and won’t come out any further due to the retainer on the transfer box end.

Does this image accurately show what the white plastic end should be looking like?
 

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UPDATE: I ordered another cable. Same part number but the version which came had a black plastic end rather than white at the clock end.

This one’s connector was much further out (like the photo above) and connected sweetly and I now have a clear Speedo reading.

I did manage to misplace the brackets which hold the clock on the binnacle, but a couple of old shelving brackets cut and bent to shape have done the job nicely.

Another job ticked off the list ✅
 
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