How to Connect a Car Horn Relay?
2 Answers
First, disconnect the non-ground wire from the horn and connect it to the terminal labeled 'button' on the relay, leaving the horn's ground wire untouched. Then, use a wire to connect the terminal labeled 'battery' on the relay to the positive terminal of the battery. Next, connect the terminal labeled 'horn' on the relay to another terminal on the horn using another wire, and ground the relay housing. Below is some relevant information about horn relays: 1. A relay is an electrical control device that establishes an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). It is commonly used in automated control circuits and essentially functions as an 'automatic switch' that uses a small current to control the operation of a larger current. Therefore, it plays roles such as automatic regulation, safety protection, and circuit switching in electrical circuits. 2. A car electric horn produces sound through the vibration of a metal diaphragm. The car electric horn consists of an iron core, a magnetic coil, contacts, an armature, and a diaphragm. When the driver presses the horn switch, current flows through the contacts to the coil, generating a magnetic force that pulls down the armature, forcing the diaphragm to move. The movement of the armature causes the contacts to open, interrupting the current and causing the magnetic force of the coil to disappear. The diaphragm, along with the armature, returns to its original position under its own elasticity and the action of a spring plate, closing the contacts and reconnecting the circuit. Current then flows through the contacts to the coil again, generating magnetic force and repeating the above actions. This cycle repeats, causing the diaphragm to vibrate continuously and produce sound. The resonator, rigidly connected to the diaphragm, ensures smooth vibration and produces a more pleasant sound (based on the principle of electromagnetism).
I've been tinkering with car circuits, and connecting the horn relay is quite fun. The relay has four pins: 85 connects to the chassis ground, 86 connects to the signal wire from the horn button, 30 connects to the positive terminal of the battery, and 87 connects to the positive terminal of the horn. Always remember to turn off the battery switch before connecting to avoid short-circuit sparks that could cause injury. Prepare some electrical tape, wire crimpers, and a multimeter to test the circuit for continuity. If you're not familiar, locate the car's fuse box—relays are usually installed there, and the space is tight, so take your time. After completion, test the horn, and you'll notice it sounds much louder. Without the relay, the button is prone to burning out. Now, the high current issue is bypassed, and you've saved on repair costs by doing it yourself.
