I recently purchased this truck and began having issues with it blowing the park/lps fuse. The guy before me had it over amped to 30 to get by. After chasing around wiring I found all of my marker lights are burned up.

What is causing them to melt at the plugs? And how would I go about fixing the problem? I’d appreciate any help, I’m not super good with vehicle electrical and most shops near me won’t touch a 30 year old truck haha.