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My idiots lights no longer come on. Failed smog inspection due to check engine light not coming on then off right after startup. My dash bulbs are not out, because they sometimes all come on. Most of the time they are all out, including my digital dash tach and speedometer. I checked fuses and tried wiggling wires. No avail. Does the wiring harness go to a pcb board???

If anyone has any ideas, please let me know.
 

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Check your grounds, my 84 used to cut out from time to time and I had to clean up the grounds to fix it. Going by memory, I seem to recall the ground at the thermostat housing being one of them.
 
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