S CLUB HERE I COME

[TJC46]

Hi guys two lots of good news to share. The car has just passed the mot with no problems whatsoever, and i have finally managed to fix my speedo. I posted a thread a few months back now after ripping the cables to the speedo sensor, to much detail to disclose here exactly how i fixed it but if anyone has a speedo problem see me at S club .

[Barkychoc]

Nice one. Steve (SEB400) and I will be forming an orderly queue with your speedo solution!

[clarenceboddiger]

Come on Tom , get it on here for future reference.

[TJC46]

Ok Ken here goes. When removing my gearbox i managed to rip the wires out of the speedo sensor plastic connector. This is a sealed item so ihad to cut the other half of the connector. Im now left with 3 wires from the speedo sensor which are brown, black, and yellow and from the other side of the now removed connector 3 wires which are brown black and grey. Ive looked at various wiring diagrams for the S series and i could not find one showing a grey wire. I tried the obvious brown to brown black to black and yellow to grey and yes you guessed it the speedo didnt work. I tested with a multimeter for a live supply and that was ok so no fuse problem. I purchased 2nd hand another speedo sensor in case that was the problem, yes you guessed right again speedo still didnt work. By now very frustrated so i left it well alone for a few weeks. Rechecked all the wiring diagrams and the GREY wire was confusing me. Upon close inspection of this wire it turns out to be double insulated i.e its like your tv co-axial cable. It has a inner copper core then a layer of insulation and then more copper strands and finally the grey insulation. I had twisted both these copper cores together so i now seperated them and tried wiring them individually. The 1st one i tried was the outer copper strands, no speedo. 2nd the inner copper core .S apeedo working a treat. Still dont fully understand the purpose of the outer copper wires is it some kind of protection from other electrical fields for the pulse signal to the speedo? Any way guys thats it i apologise for the length of this thread but Ken forced me into it.

[clarenceboddiger]

I wouldnt have suspected that for a minute, It must be as you say possibly to stop stray signals from interferring.
The only draw back is that now you have a speedo you'll have to slow down a bit.