That path is completed when you push in the horn button. When the button is pushed the ground connection is made, energizing the relay's coil "A". The coil's iron core (in this particular design) pulls down arm, connecting high-current contacts "B". High current then flows from the battery to the horn (the horn is connected to ground because it's mounted to the chassis of the car). See how it works?
First clean the wires with the wire brush to keep everything clean. The car fuse box is near the battery most of the time. Unplug the safe box by unclipping it. Depress the locking tab and pull it out. Remove the cover of the fuse box. In the cover, you can see a diagram with all the fuse positions. Here is where you need your owner’s manual to find the exact electrical diagrams needed to put the wires in the right place.
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