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1996 GMC Jimmy speedometer

Tiny
CAMPWIZARD
  • MEMBER
  • 1996 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 56,000 MILES
The speedometer quits working once headlamps or parking lamps are on, but it is not effected by daytime running lites. So at nite I set cruise control and it works fine but the speedometer does not move. Once you stop for 5 or 10 minutes it will then work fine for another 10 minutes then hand will remain stationary.
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Thursday, March 6th, 2008 AT 9:31 PM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
But the cruise works when the speedo doesnt? The Speed sensor feeds info to the PCM (computer) it in turn gives a signal out to the speedo for how fast you are going. I would look for a loose/poor connection in the back of the instrument cluster. Sounds like it is losing something when the lights come on, which could be an indicator of a bad connection that cant handle any load on it
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Friday, March 7th, 2008 AT 7:38 AM

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