02 yukon no interior lights

My 02 yukon lights have been goin on and off.now they wont come on at all.tried messing with dome overide an everything i can think of..actually first notice was mirror lights on sun visor.now all out..thanks dave

Ok so the fuses are all good.only thing i got to happen is when i turn dimmer switch dial up to on the lights outside on bottom of mirrors come on..other than that nothing