Fiat 124 Spider (2016-2019..) < Fuse Box diagram 53 rowsFuse box diagram (location and assignment of electrical fuses) for Fiat 124 Spider (2016, 2017, 2018, 2019)№DESCRIPTIONFUSE RATINGPROTECTED COMPONENTF01ENG IG35 AEngine control systemsF02ENG IG25 AEngine control systemsF03HORN27.5 AHornF04C/U IG115 AFor protection of various circuitsSee all 53 rows on fuse-box[PDF] 124 Spider Fuses and Electrical Relays - Richard Ridge since gone out of style and the 3 amp size is particularly difﬁcult to source. Fiat and German car parts vendors are the best bets. Every Spider should carry spares. Fuse Box Maintenance The function of a fuse is to protect the wiring harness itself. When a wire is overloaded the insulation melts.