2001 cherokee xj. Tail lights and dash light fuse keeps burning out. Replaced light switch in dash, still burning out fuses. Do I need to replace the tail light harness.

If the fuse keeps on blowing it is because of too much current being used by the lights you may have a bare wire in the trunk touching something causing a short circuit or one of the tail lights may be damaged if you have had something in the trunk EG. a tool box or the like that has been moving around while you have been traveling,you need to check for any damage to the lights or wiring.....hope this helps......cheers.