Replace the dimmer switch as the variable resistor (attached to the knob) is faulty and not passing current.
Your problem is most likely a neutral you need power in and out for circuit to work if the power going in is their take the positive lead on the input power and the negative on the out and make sure that there's an actual connected neutral or ground working otherwise you wont have a full circuit for the other possibility is your power is reversed the lights in the dash or not bulbs their diodes just like LEDs they only allow power one way to make them light up make sure your power is on the correct side reverse if you need to try on one bulb
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SOURCE: Replace Dash light bulbs on 2004 Malibu Maxx
you need to take the hole dash out and on the back of the speed dash there are little bulbs take them out then replace them
SOURCE: my 2002 f150 dash board lights do not work. The
You might need a new cluster .... or it is p[ossible you installed a new stero in the vehichle and one of the wires that were not used from the harness to connect to the cd player may not have been wrapped and are causing a ground.
SOURCE: Dash lights do not work. 2004 Chevy 2500HD crewcab
air conditioner 2500 silverado in dash not working
SOURCE: I have a 2002 GMC sierra 1500. Instrument Lights Not Working
When dash lights don't work odds are the tail lights don't work either.Sounds like Dimmer switch may be a problem.
SOURCE: instrument cluster bulb is out. how do i replace
It may not be a bulb, as the instrument cluster usually has a number of bulbs and they probably didn't all blow at once. Pulling instrument clusters can be touchy and may not be for the average "shadetree mechanic" however, typically there are a few screws above the cluster going into the dash pad and a few hidden behind the trim panels below the cluster.
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