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Assuming you are asking about a model year Mazda b series truck86-93.Simply it is probably the dimmer switch that rolls up and down to the left hand side on the cover for the dash cluster.To see if it is defective remove two screws on the top above the clear shield covering the gauges and two screws behind the steering column (light switch and wiper arm assembly).Just remove them pull it forward disconnect the two plug harness that is to the left hand side at the dimmer to lighten or darken the gauges and use a jumper wire in the plug.Any auto wiring will do fine,just place one end in each end of the terminal that plugs into the dimmer and turn on the lights it should work.This simply grounds the circuit to verify the switch is probably bad or has poor contact.You can clean the dimmers terminals with sandpaper and reconnect to see if it was just loose or dirty.Either way this will answer the issue and it will be a bad dimmer switch or poor connection.Worst case there may be a short in the wiring going to the dimmer,at that point more electrical diagnosis would be required.
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