1986 Mazda B2000 Vehicle Wiring Chart and Diagram ATTENTION: This wiring information is being provided free of charge and on an "as is" basis, without any representation or warranty. It is your responsibility to verify any circuit before interfacing with it by using a digital multimeter. What fuse is your horn tied to in your 86 Mazda b2000? What fuse is your horn tied to in your 86 Mazda b2000? A person can find a wiring diagram for a 1984 Mazda b2000 in its maintenance book. They can also ask for a print out at an auto part store.