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73-87 Chevy _ GMC Trucks => Interior & Equipment => Instrumentation => Topic started by: Mario on October 08, 2019, 07:42:02 PM
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My temperature gauge starts to go up when I turn on the parking lights or headlights. I also don't have the gauge lights working. My truck has been parked a couple of times, so I can't remember how things happened when they happened. What would make the gauge lights affect the temperature gauge? How do I isolate the gauge lights from the temperature signal? Thank you! Ohh... It's on my '81 K20.
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- Make sure the headlamp switch knob is rotated all the way CCW just short of the interior light detent.
- Check the instrument lamps fuse. Make sure it isn't blown and that the fuse contacts and its fuse box socket are completely clean and free of oxidation.
- Check the instrument cluster bulbs and make sure the bulb sockets are making good connections with the printed circuit board (PCB).
- Verify that the instrument cluster harness connections to the PCB are clean and free of oxidation (shiny). Use a soft pencil eraser to polish the connections if needed, but be careful that you don't peel the fragile foil away from its plastic backing.
- Check and clean the cab interior ground connections to the ground bus bar located on or near the parking brake pedal assembly on the left kick panel.
- Verify that the ground strap between the engine compartment firewall and the back of the right cylinder head is installed and snugly attached to shiny clean metal.