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First place to look is the wire on the coil. Check for corrosion. After that, if you have a schematic check other spots on the wiring. As you have a GS, I can't help you much in regard to the instrument cluster system of wiring. On the other airheads, the big plug from the main harness to the back of the instrument cluster sometimes has pins corrode. LOL, I don't know if you have the same set up.
If you don't have a schematic, EME sells the best ones, color, big, PIN numbers, all on them.
As far as the tach itself, I have never had one fail so sorry. Good luck, and I hope it is simple. St.
Just out of curiosity how is the tach and speedo mounted in a GS? is it in a pod like the other bikes or more difficult to get at them? LOL, the pods on the other bikes are kind of simple to get apart. Three bolts on the handlebar bracket, undo the speedo cable, the plug in the back has a screw to hold it in place. undo the screw, un plug the plug and the whole assembly is at hand. St.
If both the odometer and the hand (right name?) don't move I would first check the cable down to the gear box.
You can check the cable by taking it off at both ends and see if you can turn the inside wire (name?) on one end and check that it follows accordingly at the other end.
It's been a while ago but I think you can unscrew the back of the speedo to expose the inside.
The odometer shaft is driven via a worm gear and the speed is transferred via induction.
Fingers crossed, toes crossed. Perhaps wash away the evil spirits with a German beer sacrifice? St.
Oops! I better read an entry more carefully.
Indeed, there's some electronic in the tachometer. I assume you have checked the wire down to its connection at the coil.
LOL, I am going to be diving into a schematic today. I just have to figure out why the tach was fused. I am kind of assuming it is the main power lead that is fused and it is just lumped into a system of stuff BMW figured should be fused. There are only two fuses on the bikes if I recall. St.
I had not thought the GS was so much different than its brothers, I am learning otherwise. St.