1999 GMC Yukon V8 Four Wheel Drive Automatic 112000 miles
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My lights are new the fuses are good and I am getting power to the harness but the lights do not come on when the pedal is pushed down why

first thing ill ask does the third high rise brakelight work? if not chances are the brake switch is bad or misadjusted.

if the lights on then the turn signal switch has failed and you need a new one.

none of the lights work and I have replace3d the brake light switch

next make sure the plunger on the switch is being moved when the pedal is moved, does pushing on switch by hand change anything? check and makesure the third light isnt burned out and recheck for brakes.

you may want to check for damage in the harness inm cab next since all 3 dont work.