Does it blow as soon as you put a fuse in or only with the light switch on? That alone can give you a clue to narrow it down. I would next pull the headlight switch down and inspect it. Might be a short in the dash lamp dimmer. To get the switch out, unhook the battery, reach up around the switch and feel for a spring loaded mechanical release push-button, which I believe is on the top. Pull the switch to "headlights on" push the button and the knob and shaft will come out of the switch as a unit. Then rig a tool to remove the nut from the dash. Be careful not to scratch.
This is a GM switch, but Mopar ones work the same
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