Installing a Metra harness to connect a car stereo to the car's electrical system is primarily a matter of matching and securely connecting the correct wires. After removing insulation from the ends of the two matched wires, they can be connected by soldering, using connectors or crimping.
When using the soldering method, solder the wires together with heat shrink tubing. Heat shrink tubing creates strong, neat connections, which are protected by the seal formed when the shrink tubing is heated. The connector option involves slipping each of the two color-matched stripped wires into opposite ends of the connector and tightening the two caps. The connector creates a secure and strong housing for the wiring.
A crimping tool and crimp caps are required when connecting the wiring harness using the crimping method. Metra markets crimp tool sets. The correct sizing is important. While crimping can result in a viable connection, should the wires not be crimped tightly, they may come apart.
When connecting a wiring harness to a vehicle's original equipment, purchase a harness made to connect to the factory installed equipment. Color-coding for wire harnesses to be used when installing new stereos, not factory-issued, are different. To avoid damage to the equipment and voiding warranties, it is essential that wires be correctly matched.