87 to 93 Mustang Fox Fuse Box Diagram - Mustang Diagrams 87 to 93 Mustang Fox Fuse Box Diagram - 1987, 1988, 1989, 1990, 1991, 1992, 1993 plus Image Locate identify which fuse or relay is blown it may be located under dash 90 Mustang fuse box | Ford Forums > AND the cover from his fuse box. Does anyone have a diagram of a fuse > box layout for a 90 Mustang LX 5.0 they could email me? Or can someone > tell me which slot the horn fuse is in. I want to start with the fuses > and work my way towards the horns to see where the problem is. Dave covered it well, but here's a diagram in case you're more of a Instrument panel Fuse Box Diagram For 1990 Ford Mustang? Instrument panel Fuse Box Diagram For 1990 Ford Mustang? The Instrument panel fuse box is also called Under Dash Fuse box Located under the dash panel. Below you will see the Fuse box Diagram ,in this Diagram the Fuses / Relay Location are Shown and Ford Mustang (2015 - 2018) - fuse box diagram - Auto Genius Passenger compartment fuse panel Ford Mustang -fuse box – passenger compartment. The fuse panel is in the right-hand side of the passenger footwell behind a trim panel and plastic key code card.