Chevrolet Repair: 2001chevy tahoe, reostat, dash lights

Question
QUESTION: dash lights will not come on when headlights are turned on.

ANSWER: HI DANNY,CK THE FUSES ON OR UNDER THE DASH..MAKE SURE ALL OK..IF FUSES ARE OK.. POSS REOSTAT IN THE HEADLIGHT SWITCH OR SOMETIMES THESE REOSTATS ARE SEPERATE FROM THE MAIN HEADLIGHT SWITCH..I HAVE SEEN THESE BURN OUT. WE HAVE 4 TOW TRUCKS AND THE HEADLIGHT SWITCHES ARE ALWAYS BURNING OUT BECAUSE OF ALL THE LIGHTS WE HAVE ON THESE CIRCUITS.IF YOU HAVE ANY EXTRA LIGHTS THIS COULD BE THE PROBLEM...LAST BUT NOT LEASE THIS IS ALSO CONTROLLED BY THE BCM [BODY COTROL MODULE.] YOU CAN TAKE THIS TO THE DEALER OR ANYONE THAT CAN SCAN THE BCM AND SEE WHAT THE DATA IS..THIS WAY YOU CAN BY PASS THE REOSAT AND DEMAND IT TO TURN ON OR WATCH THE DATA WHEN YOU TURN THE LIGHTS ON..TAKES ALL THE GUESS WORK OUT OF IT...HOPE THIS HELPS YOU.IF NOT LET ME KNOW,,,TOM..

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QUESTION: dash lights will not come on when headlights are turned on. but will come on but will come on when dash light dimmer thumbwheel is rotated to the second notch position where dome lights come on.

Answer
HI DANNY, THIS THUMBWHEEL IS THE REOSTAT, THIS SOUNDS LIKE THIS IS SHORTED OUT..THE FACT THAT THE DASH LIGHTS DO COME ON WHEN THE SWITCH IS ALL THE WAY UP [ON DOME LIGHT SIDE IS A GOOD INDICATION THAT THAT SWITCH IS PROBABLY BAD... HOPE THIS HELPS YOU TOM..