Speedometer wiring connections
 

OK. I removed my speedo for repairs (usual odometer malfunction). Took careful photographs to record the position of the wiring connections at the back. Sent the speedo off to be fixed but lost my phone with the photographs.
So after several attempts working from memory I have the speedo lights working, but nothing else functions ( no speedo, no odometer). Where do the wires connect at the back to have the instrument functioning properly ? I have stopped for the evening before I start using my big hammer :mad:.

Forgot to mention that this is a VDO gauge from a 1977.

red/black to 12v connection. brown/red to 31b connection. black/blue to inst. light connections.

found this, may help

http://forums.pelicanparts.com/porsche-911-technical-forum/792042-can-anyone-id-these-loose-wires-behind-speedo.html

this looks like a good one also.
http://forums.pelicanparts.com/porsche-911-technical-forum/793431-need-guidance-troubleshooting-speedometer-problem.html

C:\Documents and Settings\brian.JMHC\My Documents\My Pictures\SPEEDO WIRES

http://forums.pelicanparts.com/uploa...1392747156.jpg


Thanks for the input guys, but still no speedo/odometer. I have the wires as follows: moving clockwise from the left hand side as seen.

---red/blue and red/black on first connector
---no connector
---red/white on second connector
---solid brown and solid brown on third connector
---brown/red and brown/red on fourth connector

The lights are okay.

What have I got messed up here?

I think you have the two brown/red speed sensor wires connected to the same terminal on the far right of your picture. In my '79SC the two speed sensor wires come out of a black sleeve together with the black/red 12V power wire. I am not absolutely sure but for my '79SC speedometer the correct wiring should be as shown here:

http://forums.pelicanparts.com/uploa...1392757937.jpg


For comparison, my '79SC speedometer wiring:

http://forums.pelicanparts.com/uploa...1392758059.jpg

It's alive !!!

Thanks to everybody, and the final push from porwolf was the clincher.

It still doesn't seem right to have a speed sensor wire piggy backed with a ground wire and then plugged in, but hey it works!! .