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This is more than likely an internal fault in the instrument cluster since the other lights stay bright and you can control them. I suspect that you may need to remove the cluster and have it rebuilt to cure this problem
I have had this problem for over a year and a half and the middle/bright lights can be cut on,but i have to hold the switch in to keep them on. The parking lights stay on all the time,so i assume it's a "running" setup. I've had the light "switch" replaced for about $450 and then the guy tells me..."oh,it's the "relay" that needs to be replaced",but releases the car to me as if it's ready to go?? The fuse is still good,but not sure about the bulb. Guess you can't assume a crooked mechanic is going to check that,right??
anyway,thanks for the input.
CHECK THE ILLUMINATION SWITCH ON HEAD LIGHT THAT CONTROL DASH CONTROL BRIGHTNESS IF ILLUMINATION SWITCH TURN FULLY ON. INTERIOR DOME LIGHT WILL STAY ON.IF YOU HAVE BAD DOOR AJAR SWITCH DOME LIGHT WILL STAY ON.
DOME LIGHT STAYING ON BECAUSE YOU HAVE BAD DOOR SWITCH OR BRIGHTNESS SWITCH ON HEADLIGHT SWITCH THAT CONTROL DASH BRIGHTNESS AND IF BRIGHTNESS SWITCH IN FULL ON POSITION ON HEAD LIGHT SWITCH IT WILL CAUSE DOME LIGHT TO STAY ON.
Most often the tail lights and dash lights share a single feed and fuse.
Assuming you have checked the fuses (probably marked as tail or courtesy)
If you have good fuse and the head light gives a voltage out while in the 'parking light' position (usually between off and headlights) then you need to start chasing wiring.
1990 Jeep Wrangler. Driving with lights on for 10 - 15 minutes. First the dash lights go out followed by the headlight and tail lights. If you pull the dimmer switch back (like you would to flash your brights at someone) the head lights will come on and as long as you continue to pull back on the dimmer switch the head lights will stay on bright.