- 1). Cut a 10-foot length of 18-gauge wire. Strip 1/4-inch of insulation from one end and slide the eyelet connector off of it, then crimp the connector. A 3/8-inch eyelet connector will work in most cases, but your particular application may require a 1/2-inch eyelet.
- 2). Locate the starter solenoid (main relay). Older cars and trucks often used a remote starter solenoid, but modern starters typically use an integrated solenoid. To find the solenoid, follow the thick red cable coming from your car's battery terminal. It connects to the starter solenoid.
- 3). Identify the small wire attached to the starter solenoid. This is the solenoid's trigger wire, and it's connected on the other end to the ignition key's lock mechanism. When you start the car, power flows through this wire, triggering the solenoid and starting the car.
- 4). Remove the small nut that secures the trigger wire to the solenoid, being careful not to lose any of the small washers. Slide the eyelet connector over the stud on the solenoid and reinstall the nut. Route the wire through your engine bay toward the horn. Zip-tie the wire in place as you route it, keeping it well away from anything hot or moving.
- 5). Cut the wire to length so that it terminates next to the red wire going into the horn. Slide the wire's end into the closed part of the blade-type splice and snap the open part over the red or white wire going into the horn. If your wires are any other color, snap the splice over the lighter-colored one.
- 6). Push the metal blade down into your wires to splice them together, then close the flip cover on the splice. Wrap the wire splice and a three-inch section of wire with electrical tape to secure them together. Start the car to test your work and see if the horn goes off.
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