If your 1979 Dodge van horn isn't working at all, troubleshooting involves checking several things in this order:
1. Fuses: Check the fuse box (usually under the dash or in the engine compartment) for a blown fuse related to the horn. Consult your owner's manual to locate the correct fuse. A blown fuse is easily replaced.
2. Horn Relay: Many Dodge vans use a relay to switch the high current needed for the horn. The relay is typically located in the fuse box or a separate relay center. It might be labeled "horn" or have a diagram showing the horn circuit. You can test the relay by swapping it with a known good relay of the same type (often a simple swap). A clicking sound when you press the horn button but no horn sound often indicates a bad relay.
3. Horn Wiring: With the ignition on, test the wiring to the horn. Use a test light or multimeter to check for 12V power at the horn's electrical connector when the horn button is pressed. If there's no power, trace the wiring back towards the steering column switch and the relay, looking for broken or corroded wires.
4. Horn Button (Steering Wheel): The horn button itself might be faulty. This is less common but possible. Testing the wiring coming from the horn button to the relay is the best way to rule this out.
5. The Horn Itself: If power is reaching the horn's connector but it still doesn't sound, the horn is likely faulty. This requires replacing the horn unit.
Important Safety Note: Always disconnect the battery's negative terminal before working on any electrical components in your vehicle. This prevents accidental shorts and shocks.
If you're not comfortable working with car electrical systems, it's best to take your van to a qualified mechanic for diagnosis and repair.
