Jeep: Sporadic malfuntion of the Tach and Speedmeter

Ever so often when started the Tach and Speedo do not function, the needles
stay on zero. The really strange part is that if I flip the rear defroster
switch on and off they start working? This a 1997 Sport 4.0 ltr with hard
top. Any ideas would be appriciated.

Dale Peterson

I also have a 99 Wrangler. I had the same problem. It stems from a "Design
Issue" with the instrument cluster. Oxidation will develop on a couple of
pins causing the circuitry to not function properly. Basically, a bad
connection.

There is a TSB (Technical Service Bulletin) 08-15-99 issued in May of 1999
describing the cure. I got a copy of the TSB. It has a diagram and specific
info. I removed the instrument cluster and scraped the oxidation off the
appropriate pins and re-installed. The oxidation is difficult to see. I used
a small magnifying glass to verify. No more problems to date. That was about
2 years ago.

The actual cure requires a new connector and cutting the old one from the
harness and soldering the new one in.

To me, it was easier to remove the cluster and scrape the pins.

Hope this helps...


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