fuse problem
 

86z had interior lights go out and radio ,found 30amp fuse blown try to replace but when i do horn comes on help thanks

The information you give is kind of sketchy. What circuit was the 30 amp fuse labeled on the block for and did the interior lights and radio operate after replacing the fuse too? A wiring diagram would be a big help in a case like this. You're going to need to know what equipment is powered by the blown fuse to determine how the interior lights, radio and horn tie into this problem.

Just keep in mind it is probably not a fuse problem. Its an electrical problem and the fuse is stopping the car from burning to the ground. In dash fires can be almost impossible to put out with out the right equipment and the right equipment makes one hell of a mess.

My first thought was a 30 amp fuse sounds very high for a circuit powering interior lights and a radio, so someone has increased the amperage rating of the fuse because it kept blowing with the factory rated fuse size. If there is an electrical problem with the equipment of a circuit, using a higher rated fuse can turn that circuit's wires into a "toaster element" because of the increase in amperage allowed by the higher rated fuse. This could lead to damage of the wire before the fuse blew at the higher amperage by melting its insulation and also causing similar damage to anything else that comes in contact with it, including starting a fire.

thanks peterpar

thanks will try to get electrical diagram for circuit

car has air if that makes a difference not hooked up