So the fuse for my running lights/dash lights keeps blowing, buddy said I should replace the headlight switch, so I did. And it fixed it, for a little bit. But then they stopped working again. I've recently done the headlight harness upgrade with Delta halogen H4 headlamps to replace the old ones. I'm also running LED towers from SuperBrightLEDs for the taillights/brakelights if that means anything. You can see where the old switch has melted here. Does anybody know where the fault could be? And also confirm or deny the size of the fuse for said lights is 15 amps?
1993 Cherokee 4.0 5 speed

 

A short in the taillamp system?

Do you have a cobbled up trailer wiring set up in the rear?