I hate car electrics!!! Speedo failiue

[andyscutt]

It was all going so well. Just bought an '82 SC Targa and finished off the essential repairs and it was time to tidy up inside. The clock wasn't working and I wanted to change the bezels on the guages.
First up I popped the clock out and tried to fix it (no joy) but when I put it back in to test it I believe I got the wires the wrong way round first time. Clock still doesn't work.
Next up I popped all the guages and changed the bezels and started to re-install them. Everything went well until I got to the speedo. According to my notes I made when I removed the speedo the blk/red wire was on the second terminal down (marked A not +). All the other connections seem fine but as soon as I connect the red/blk wire the speedo shoots to 160mph and nothing I have tried seems to fix it. It was working fine before I removed it.

Please any help??? I have searched through all the old posts but it not been much help.

Thanks

[curiousone940]

According to the Bentley repair manual for the 84-89 years, red/blk to the "+" terminal and wht/red to the "A" terminal.

[andyscutt]

Thanks,

Does it say what the white and red wire is for as I don't seem to have a white and red wire!!
Also, can anyone explain to me how the Speedo actually works so I can try to fault find this problem. I really hope I don't need a new Speedo!!

Thanks again

[andyscutt]

Thanks,

Does it say what the white and red wire is for as I don't seem to have a white and red wire!!
Also, can anyone explain to me how the Speedo actually works so I can try to fault find this problem. I really hope I don't need a new Speedo!!

Thanks again