When a fuse blows, it indicates that there is a short somewhere in the circuit. Replacing the blown fuse with a higher-amp rated fuse does not solve the problem. It can actually make it worse, since you are essentially eliminating the safety feature of the original rating for the fuse. You can damage the wires that are protected by the fuse, even melt them, or cause a fire, so don't do what you've already said you did, ever. It can also damage the fuseblock, melting it and making it hard to install fuses, and replacing a fuseblock is no fun at all.
You need to trace the wires to the dome light, through the door switches, and everywhere else the circuit goes, including the headlight switch and maybe some lights under the package tray, if you have those. If all the wires are fine(like no melted or worn-through insulation or bad tap-ins), then there is a component that has failed, like possibly the headlight switch or a door switch. Make sure that no one has tapped into the circuit to add something like extra interior "mood lighting" or wiring for a stereo or anything else, and done a poor job of installing it. The headlight switch has a separate black ground wire that attaches to the back, not part of the rest of the switch connector, make sure that is there. Also check the grounds for the dash wiring harness, which someone here can probably direct you where to look for it, since I forget where it is.
Topic: 1983 SX/4 KEEPS Blowing fues's (Read 1828 times)