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Look at your fuse panel board either under the dash board on drivers side or possibly under the hood depending on vehicle. It will tell u which fuse is for the headlights.
Or from the sounds of it... Possible head light bulb burnt out and not a fuse. A headlight fuse should not be popping or burning out. I would suggest looking at the filament on the bulb to see if intact. Replace broken head light bulb with working other working headlight to eliminate one possibility. If it works buy a new bulb. If it doesn't look at fuse panel.
You probably already know this, however the GMC 2002 Yukon Denali uses the Wagner 3157 (or equivalent) dual element bulb. The running light uses one element whereas the brake & blinker share the other element that burns brighter.
Check to ensure the correct bulbs are being used. Then check all wire harness connections. Since the blinkers function, then it sounds like the connections are good.
It really sounds like there is a bulb issue, so check that first, then let us know the results.
You know the fuse for the high beams is good ( Cab fuse panel fuse # 16 ) and the pass low beam fuse ( cab fuse panel # 26 ). Might want to check cab fuse panel fuse #28 ( this is the driver's side low beam ).
If this fuse has power on both sides ( with the low beams on ) next you can pull the headlamps, and check for power at the connectors, but depending when the last bulb change took place, I would say you need need bulbs. ( need at least 1 for the high beam out ) Confirming with a meter at the headlamp would be a good idea, before spending the money.
The bulb connector has 3 pins. Black wire is ground on both sides Light Green w/ Black stripe wire is high beams on both sides Driver Lo = Dark Blue w/ white stripe Pass Lo = Dark Green w/ Orange stripe.
replace flasher......usually located in fuse block area...listen in this area....select passenger side ...then select driver side...you can hear flasher clicking...you have seperate flashers for each...FLASHERS are small cubes plugged into fuse block....probable bad driverside flasher