the gauge cluster acts strange

1989 CHEVROLET TRUCK

197,000 MILES • 6 CYL • 4WD • MANUAL

PARADACTAL

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Ever since I just bought this truck, the gauge cluster acts strange. First of all, it is a mechanical gauge. Next, I have no oil pressure at all. My odometer does not work. My temperature gauge randomely bounces from normal to hot. When I turn the engine off, and dont drive it for a day or so, I start it and my temp gauge still is reading hot(in the red). Ive changed my thermostat and make sure there are fluids. Just trying to pinpoint the problem without spending to much money. Oh yeah and my "check gauge" light has always been on.

Feb 24, 2009 at 11:38 PM

SQM

CAR REPAIR CONTRIBUTOR
6,383 POSTS

Hello,

Given several of the gauges are inoperative or not working properly, it is likely due to a faulty gauge cluster. Those gauges are controlled by stepper motors, which gets signal from the computer to operate. Those motors overtime goes bad and can work intermittently or not work at all.
Many times, you will be able to get replacement stepper motors to fix those gauges.
This will require the removal of the cluster.

It will also be a good idea to check all the wirings and make sure there is power to those gauges. I have included the wiring schematics for the gauge cluster below.

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

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.

Images (Click to enlarge)

Oct 31, 2021 at 9:33 PM

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