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My 84-89 Cluster won't light up - What's Wrong?

Posted by Bryan Thompson on

Before starting this test, make sure the battery is charged, that all fuses are good, and that the cluster is connected to the wiring harness connector. 1)  Turn the key on (engine off).  What should happen at this point is the four illumination bulbs should light up full brightness, and all segments on the cluster should turn on.  After the first two seconds, the display should resolve into 0MPH/0RPM.  After that, the cluster starts responding to light from the photocell.  If the cluster is somewhere dark, the brightness may decrease.  If you're out in sunlit conditions, it should remain full...

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