Mustang Headlight Switch Connector (87-93) - LMR Mustang Headlight Switch Connector 1987-1993 Mustang GT's had a common problem where the headlight wiring over-heated during continual use of the fog lights. This overheating issue caused the plastic plug to melt and malfunction. If this has happened to your Fox Mustang, 5.0 Resto has a repair harness to replace your melted harness! wiring diagram, 87 GT Headlight Switch - Google Groups >Subject: wiring diagram, 87 GT Headlight Switch >My son's Mustang's headlight switch melted (probably loose connection caused >it). He wants me to put a new one in for him. Does anyone have a wiring >diagram. The reason the headlight switch melted is how to test wire troubleshoot GM headlight switch - YouTube Click to view on Bing17:35ALL MY VIDEOS ARE IN 1080p HI DEF so check that out this video is a bout the very common 4 function GM headlight switch that was around from about 67 - 88 ( im sure more years ) just going over how its wired, how to Author: Chris CraftViews: 90K How To Install Fox Body Mustang Headlight Switch And How To Install Fox Body Mustang Headlight Switch And Harness (87-93) This headlight switch has a perfect fit, and finish to look and feel just like the OE Ford part, just at a fraction of the cost!