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hi ,ive got exactly the same problem on my cherokee,ther is a sound of a relay buzzzing under the dash.when i turn on the side lights,nothing,turn on headlamps and i get dip plus side lamps,no dash lights though,after a whils all lights fail but i can pull/flash main beam and hold it on,im taking out the dash area tomorrow,friday ,i have aspare headlamp switch and relay/fuse box ,my mobile is 07712128561,ill keep you posted
You don't say if it's "just" the dash lights, or if other lights do it as well. Try turning on a dome light and see if the dome light does it along with the dash lights. Do you notice your headlights doing this as well? These are just troubleshooting steps. If multiple light sources (dome, headlight, etc.) do it, then it's most likely a voltage regulator issue.
I have a 2002 and one day had no headlight or dash lights. The tail lights, blinkers and hazards work just fine as do the radio of dome lights. Changed the multi-function and checked all fuses, but no help. I am interested in the solutions as well.
I think I have found the problem. When I wiggle the ignition switch the turn signals and radio go on and off so I feel the issue is in the ignition switch. From what I understand the actual electronics for the switch are at the base of the sterring column behind the lower dash panel and is connected by a rod that may need adjusting.