more funky speedo symptoms

[RCCola]

I'm still troubleshooting the erratic speedo in a 92 W-250 5 speed.



The mechanicals are all good. I tightened the contacts on the connector at the t-case and put dielectric grease on them. I looked at the back of the instrument panel, but since all the gauges are plugged in two large round connectors, I didn't mess with it (don't know which wires are for speedo).



Now the weirdness--if I'm driving and the speedo doesn't work, I can turn the lights on and it will usually (not always) bounce around then work. I called the PO and asked him. "Oh, I forgot to tell you about that. " Ok. Sure. But he said it's worse in the winter and usually if you hit the dash it will start working (but it didn't work for me when I tried).



That seems to indicate the speed sensor is not the problem, do you agree? Does that only leave the speedo itself and grounding issues?

 

[Philip]

Check your dash board grounds. They are located behind the panel to the lower right of the steering column. If you drop the panel under the column and look up behind the panel you can see the wires that way.



Also check the body ground off of the battery. This is the small wire coming off the neg terminal. From the factory it has paint under it. Remove the paint and get a better gound.



Then let us know if the problem is still there.