Tahoe with no daylight running lights

I have a 1999 2dr tahoe that has blown the daylight running light fuse. It will blow another when replaced. Did anyone have this problem and if you did how did you fix it? thanx.

If the fuse is blowing, you have a direct short to ground somewhere in the circuit,
Remove the DRL relay and install another fuse. if the fuse blows, then the problem is between the fuse and the relay (quite possibly the diode) if the fuse is OK then the problem is from the relay on...