instrument cluster/dash lights flicker at night

we have had this problem for a while now. the truck is a 97 JGC Laredo. its rather annoying. while driving at night, the dash lights will randomly flicker (sometimes when you hit a bump, other times when on a smooth hwy). the driver info center is unaffected by this, it is fine. Headlights also stay on and are unaffected. I believe the problem lies within the dimmer switch. if the lights start to flicker, and you press down on the dimmer switch slider, the lights will stay on. any ideas on how to fix would be greatly appriciated. thanks in advance.

This Is Going To Require Some In Depth Electrical Diagnosis-what I Have Seen Before Is An Electrical Connector Pin Start To Seperate Therefore Increasing Resistance In The Circuit And Actually Melt The Connectors Electrical Grease Inside Itself.look For Any Sign Of Melted Plastic Or Grease Dripping Inside Or On The Back Of The Dash Panels. Try To Smell Around All Connectors. This May Be A Job You Would Want A Professional To Look At. Hope This Helps

Have you had the stereo out lately? if the orange wire to the stereo gets an intermittent ground it will cause the dash to flicker--I know, replaced my stereo, pinched the orange wire--no dash lights