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hello same pronlem with my 98 durango but right turn signal!
what it was is the 4 pin connector for the tow package had the insulationripped off them i guess whe backing out of a steep driveway it sxrapped! so the headlights, turn signals, and brake circuits where grounding out! quick fix!
check your dash light dimmer switch. it is usually by the headlight switch, it might of gotten bumped accidently. if this doesn't fix your issue then i need to know if all dash lights are out or just the ones in the instrument cluster.
sounds like you adjusted your instrument lights. try turning the knob on the head lights to turn the lights back up. if that is not the switch, the owners manual will show you if there is a separate switch on the dashboard to adjust the instrument cluster with.
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Check that your tailights/parking lights are working (not the headlights) as this fuse and relay feeds all the instument lights too.... Fuse 15amp TAIL & Tailight Relay
If not then check:
The rheostat (also known as the dimmer switch) may be faulty
as it controls all the illumination of all the backlight bulbs and other dimable switches/indicators.
In general bulbs all together draw a fair amount of current so it is possible that the wiring or ground at the major supply junction feeders has failed but that is a less common problem.
So check the rheostat dimmer wiring area first as all illumination power goes through it.
There is further simple testing we can do with the three wires at the rheostat you can check the entire illumination system.
If you jumper the white/blk to the white/blk all the illumination lights should come on (that means the rheostat is bad).
Or use a voltmeter and measure the green rehostat wire to ground it should be 12volts (if not time to check the fuse, relay and wiring)
If not then finally declare the instrument panel faulty (like burned up circuit board trace).
Note of interest: the rheostat also controls (dims) other switches not associated with the instrument cluster such as the cigarette lighter bulb and hazard switch and radio player and A/C control switch. So if those are dimming but not the instrument panel backlights then yes the instrument cluster needs fixing or a very close wiring inspection.
I had the same problem. The local collector Corvette dealer ("Fairly Reliable Bob's" is their name, and I am not joking.) told me they see it all the time and that it is due to a faulty turn signal sub-assembly.