Pull the fuse and the bulbs. Test resistance between the <span class="ev_code_RED">+</span> & - wires at the bulb end of the harness. You should get no continuity. If there is any, the wiring is the problem. If you pulled power for the DRL's from the markers rather than the trip wire for the DRL's from that marker lamp circuit, you may have fried the insulation somewhere and created a soft intermittent short.
Is it blowing the fuse instantly or after it's been on for a while?
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