Head light 'relay / switch' burnt at fuse box

[ingmire]

Hello

trying to get my head lights back on. At the fuse box where the relay plugs in is melted. When I'm driving at night I can get the lights working sometimes by jiggling the relay but it gets dangerously hot with the lights on for a couple hours. I just removed the glove box and got a look behind the fuse box. I was hoping to be able to unplug 'something' and pull the fuse box out for a closer look. It appears that is not an option. Mayb an after market job has already been done back there. The wires are pretty tight not leaving much play for inspecting the fuse panel and the wires are wrapped all together with electric tape. Any advice on where to start to fix my problem? 87 4x4 5spd