(T) 1978 x1/9 fuse & relay identification - The FIAT Forum www.fiatforum›FIAT Cars›X1/9Sep 02, 2014i currently have a 1978 bertone x19. im no stranger to the x1/9,s as ive owned a 79 and a couple 82's however this 78 seems a little harder to find literature for. what im looking for particularly is a simple fuse and relay identification chart. ive found several wiring diagrams for similar year and model combinations but nothing spesific to Fiat X1-9 Main Supply Fuse Box Diagram – Circuit Wiring Fiat X1-9 Main Supply Fuse Box Diagram. Fiat X1-9 Main Supply Fuse Box Map. Fuse Panel Layout Diagram Parts: light switch, combination switch, hi-lo beam switch, battery, ignition coil, fuse unit, hi lo beam relay, headlight raise diverter relay.