Speedometer quandary

[rufrob]

Took my 81-930 out for spin for the first time in many years. The speedometer stopped working. I am getting a pulse signal from one of the brown/red wires at the speedometer.
I’ve done a lot of reading but can’t seem to find the correct answer. Should there be a pulse from both wires and what is the correct connection at the speedometer.
Some say Red, blank, Br/R signal, Br/R and Br or R, blank, BrR and BrR, Br


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[snbush67]

Is everything else working, lights? Might be the electrical part of your ignition switch, try wiggling the key when driving.

[rufrob]

Nope. Still not moving. checked all the fuses gonna see if I can swap speedometer with a buddy.


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[snbush67]

Speedometer wiring connections

Originally Posted by porwolf

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:




For comparison, my '79SC speedometer wiring:

[rufrob]

Some parts in the speedometer failed. Got it repaired and I’m back in business trying to “test” its operating range.


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