No clearance lights

I have a 86 D21 hard body Pu and just a few days ago my dash and tail lights went out. I checked and found a fuse blown. I replaced fuse and it blew right away. I have been trying track down where the short is, but cannot find any wires loose or bare. Anyone know where to look next?

triple post

triple post?? Explain.

I disconnected the alarm system and no more problem. I figure a short in the lighting part of the alarm circuit.