dash lights

My Son had dash lights go out after replacing new battery, which I learned trailblazers are know for this. I replaced the instrument cluster but still no dash lights, every thing works. The odometer dims corectly just not the back lights.traced the circuit board wiring and it test good. pins a5 & a7 on connector. I can't find wiring diaghram from headlamp switch to cluster.If you know where I can get diaghram on line Please let me know.
I'm new to this form and dont know where excatly I should be posting this.
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