speedo inop

1990 GMC SONOMA
101,499 MILES • 4.3L • 6 CYL • 4WD • AUTOMATIC
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JOSEPH MOORE
  • MEMBER
  • 1 POST
I had to put analog cluster in until i find someone to fix digital for decent price and speedo on analog does not work, but cruise works. I can't seem to fond schematic for that circuit, I hooked speedo input wire from digital harness to pin 14 but still no response.I am a retired master Nissan technician and usually pretty fair at electrical but without diagram and not much gm experience Im kindof at dead end.
Oct 26, 2021 at 4:13 PM
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KASEKENNY
  • ASE Certified Mechanic
  • 18,907 POSTS
  • ASE Certified Mechanic
Couple questions. Does the odometer work? If so, then we need to know what vehicle this analog cluster came out of.

The speedometer and odometer are run off the same input circuit. So, if one is working and the other is not then the cluster is the issue.

https://www.2carpros.com/articles/how-to-check-wiring

I am attaching the info from the manual on this operation and the wiring diagram from the DRAC to the cluster.

Take a look at this info and let us know what you find with the testing below.

Thanks
Oct 28, 2021 at 4:09 PM
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